diff --git a/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.spec.ts b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.spec.ts
index 3c9b575027..cfffc5ddb7 100644
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.spec.ts
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.spec.ts
@@ -1,4 +1,6 @@
-import { DsDynamicLookupRelationExternalSourceTabComponent } from './dynamic-lookup-relation-external-source-tab.component';
+import {
+  DsDynamicLookupRelationExternalSourceTabComponent
+} from './dynamic-lookup-relation-external-source-tab.component';
 import { ComponentFixture, TestBed, waitForAsync } from '@angular/core/testing';
 import { VarDirective } from '../../../../../utils/var.directive';
 import { TranslateModule } from '@ngx-translate/core';
@@ -6,7 +8,7 @@ import { RouterTestingModule } from '@angular/router/testing';
 import { EventEmitter, NO_ERRORS_SCHEMA } from '@angular/core';
 import { PaginatedSearchOptions } from '../../../../../search/models/paginated-search-options.model';
 import { SearchConfigurationService } from '../../../../../../core/shared/search/search-configuration.service';
-import { of as observableOf } from 'rxjs';
+import { of as observableOf, EMPTY } from 'rxjs';
 import {
   createFailedRemoteDataObject$,
   createPendingRemoteDataObject$,
@@ -22,11 +24,13 @@ import { SelectableListService } from '../../../../../object-list/selectable-lis
 import { Item } from '../../../../../../core/shared/item.model';
 import { Collection } from '../../../../../../core/shared/collection.model';
 import { RelationshipOptions } from '../../../models/relationship-options.model';
-import { ExternalSourceEntryImportModalComponent } from './external-source-entry-import-modal/external-source-entry-import-modal.component';
 import { createPaginatedList } from '../../../../../testing/utils.test';
 import { PaginationService } from '../../../../../../core/pagination/pagination.service';
 import { PaginationServiceStub } from '../../../../../testing/pagination-service.stub';
 import { ItemType } from '../../../../../../core/shared/item-relationships/item-type.model';
+import {
+  ThemedExternalSourceEntryImportModalComponent
+} from './external-source-entry-import-modal/themed-external-source-entry-import-modal.component';
 
 describe('DsDynamicLookupRelationExternalSourceTabComponent', () => {
   let component: DsDynamicLookupRelationExternalSourceTabComponent;
@@ -187,12 +191,13 @@ describe('DsDynamicLookupRelationExternalSourceTabComponent', () => {
 
   describe('import', () => {
     beforeEach(() => {
-      spyOn(modalService, 'open').and.returnValue(Object.assign({ componentInstance: Object.assign({ importedObject: new EventEmitter<any>() }) }));
+      spyOn(modalService, 'open').and.returnValue(Object.assign({ componentInstance: Object.assign({ importedObject: new EventEmitter<any>(), compRef$: EMPTY }) }));
+      component.modalRef = modalService.open(ThemedExternalSourceEntryImportModalComponent, { size: 'lg', container: 'ds-dynamic-lookup-relation-modal' });
       component.import(externalEntries[0]);
     });
 
     it('should open a new ExternalSourceEntryImportModalComponent', () => {
-      expect(modalService.open).toHaveBeenCalledWith(ExternalSourceEntryImportModalComponent, jasmine.any(Object));
+      expect(modalService.open).toHaveBeenCalledWith(ThemedExternalSourceEntryImportModalComponent, jasmine.any(Object));
     });
   });
 });
diff --git a/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.ts b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.ts
index e5ea98e537..22fcc4e8bb 100644
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.ts
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.ts
@@ -1,4 +1,4 @@
-import { Component, EventEmitter, Input, OnDestroy, OnInit, Output } from '@angular/core';
+import { Component, EventEmitter, Input, OnDestroy, OnInit, Output, ComponentRef } from '@angular/core';
 import { SEARCH_CONFIG_SERVICE } from '../../../../../../my-dspace-page/my-dspace-page.component';
 import { SearchConfigurationService } from '../../../../../../core/shared/search/search-configuration.service';
 import { Router } from '@angular/router';
@@ -16,7 +16,8 @@ import { PaginationComponentOptions } from '../../../../../pagination/pagination
 import { RelationshipOptions } from '../../../models/relationship-options.model';
 import { NgbModal, NgbModalRef } from '@ng-bootstrap/ng-bootstrap';
 import { ExternalSourceEntryImportModalComponent } from './external-source-entry-import-modal/external-source-entry-import-modal.component';
-import { hasValue } from '../../../../../empty.util';
+import { ThemedExternalSourceEntryImportModalComponent } from './external-source-entry-import-modal/themed-external-source-entry-import-modal.component';
+import { hasValue, hasValueOperator } from '../../../../../empty.util';
 import { SelectableListService } from '../../../../../object-list/selectable-list/selectable-list.service';
 import { Item } from '../../../../../../core/shared/item.model';
 import { Collection } from '../../../../../../core/shared/collection.model';
@@ -114,9 +115,9 @@ export class DsDynamicLookupRelationExternalSourceTabComponent implements OnInit
   modalRef: NgbModalRef;
 
   /**
-   * Subscription to the modal's importedObject event-emitter
+   * Array to track all subscriptions and unsubscribe them onDestroy
    */
-  importObjectSub: Subscription;
+  protected subs: Subscription[] = [];
 
   /**
    * The entity types compatible with the given external source
@@ -161,30 +162,40 @@ export class DsDynamicLookupRelationExternalSourceTabComponent implements OnInit
    * @param entry The entry to import
    */
   import(entry) {
-    this.modalRef = this.modalService.open(ExternalSourceEntryImportModalComponent, {
+    this.modalRef = this.modalService.open(ThemedExternalSourceEntryImportModalComponent, {
       size: 'lg',
       container: 'ds-dynamic-lookup-relation-modal'
     });
-    const modalComp = this.modalRef.componentInstance;
-    modalComp.externalSourceEntry = entry;
-    modalComp.item = this.item;
-    modalComp.collection = this.collection;
-    modalComp.relationship = this.relationship;
-    modalComp.label = this.label;
-    modalComp.relatedEntityType = this.relatedEntityType;
-    this.importObjectSub = modalComp.importedObject.subscribe((object) => {
+
+    const modalComp$ = this.modalRef.componentInstance.compRef$.pipe(
+      hasValueOperator(),
+      map((compRef: ComponentRef<ExternalSourceEntryImportModalComponent>) => compRef.instance)
+    );
+
+    this.subs.push(modalComp$.subscribe((modalComp: ExternalSourceEntryImportModalComponent) => {
+      modalComp.externalSourceEntry = entry;
+      modalComp.item = this.item;
+      // modalComp.collection = this.collection;
+      modalComp.relationship = this.relationship;
+      modalComp.label = this.label;
+      modalComp.relatedEntityType = this.relatedEntityType;
+    }));
+
+    this.subs.push(modalComp$.pipe(
+      switchMap((modalComp: ExternalSourceEntryImportModalComponent) => modalComp.importedObject)
+    ).subscribe((object) => {
       this.selectableListService.selectSingle(this.listId, object);
       this.importedObject.emit(object);
-    });
+    }));
   }
 
   /**
    * Unsubscribe from open subscriptions
    */
   ngOnDestroy(): void {
-    if (hasValue(this.importObjectSub)) {
-      this.importObjectSub.unsubscribe();
-    }
+    this.subs
+      .filter((sub) => hasValue(sub))
+      .forEach((sub) => sub.unsubscribe());
   }
 
   /**
diff --git a/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/external-source-entry-import-modal/themed-external-source-entry-import-modal.component.ts b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/external-source-entry-import-modal/themed-external-source-entry-import-modal.component.ts
new file mode 100644
index 0000000000..26e6097c2d
--- /dev/null
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/external-source-entry-import-modal/themed-external-source-entry-import-modal.component.ts
@@ -0,0 +1,22 @@
+import { ExternalSourceEntryImportModalComponent } from './external-source-entry-import-modal.component';
+import { ThemedComponent } from '../../../../../../theme-support/themed.component';
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'ds-themed-external-source-entry-import-modal',
+  styleUrls: [],
+  templateUrl: '../../../../../../../shared/theme-support/themed.component.html',
+})
+export class ThemedExternalSourceEntryImportModalComponent extends ThemedComponent<ExternalSourceEntryImportModalComponent> {
+  protected getComponentName(): string {
+    return 'ExternalSourceEntryImportModalComponent';
+  }
+
+  protected importThemedComponent(themeName: string): Promise<any> {
+    return import(`../../../../../../../../themes/${themeName}/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/external-source-entry-import-modal/external-source-entry-import-modal.component`);
+  }
+
+  protected importUnthemedComponent(): Promise<any> {
+    return import(`./external-source-entry-import-modal.component`);
+  }
+}
diff --git a/src/app/shared/form/form.module.ts b/src/app/shared/form/form.module.ts
index 598cc2d32c..c3062b4231 100644
--- a/src/app/shared/form/form.module.ts
+++ b/src/app/shared/form/form.module.ts
@@ -37,6 +37,7 @@ import { FormBuilderService } from './builder/form-builder.service';
 import { DsDynamicTypeBindRelationService } from './builder/ds-dynamic-form-ui/ds-dynamic-type-bind-relation.service';
 import { FormService } from './form.service';
 import { NgxMaskModule } from 'ngx-mask';
+import { ThemedExternalSourceEntryImportModalComponent } from './builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/external-source-entry-import-modal/themed-external-source-entry-import-modal.component';
 
 const COMPONENTS = [
   CustomSwitchComponent,
@@ -64,6 +65,7 @@ const COMPONENTS = [
   ChipsComponent,
   NumberPickerComponent,
   VocabularyTreeviewComponent,
+  ThemedExternalSourceEntryImportModalComponent
 ];
 
 const DIRECTIVES = [
diff --git a/src/app/shared/theme-support/themed.component.ts b/src/app/shared/theme-support/themed.component.ts
index 87f182a5ff..2a85dae402 100644
--- a/src/app/shared/theme-support/themed.component.ts
+++ b/src/app/shared/theme-support/themed.component.ts
@@ -11,7 +11,7 @@ import {
   OnChanges
 } from '@angular/core';
 import { hasValue, isNotEmpty } from '../empty.util';
-import { from as fromPromise, Observable, of as observableOf, Subscription } from 'rxjs';
+import { from as fromPromise, Observable, of as observableOf, Subscription, BehaviorSubject } from 'rxjs';
 import { ThemeService } from './theme.service';
 import { catchError, switchMap, map } from 'rxjs/operators';
 import { GenericConstructor } from '../../core/shared/generic-constructor';
@@ -25,6 +25,12 @@ export abstract class ThemedComponent<T> implements OnInit, OnDestroy, OnChanges
   @ViewChild('vcr', { read: ViewContainerRef }) vcr: ViewContainerRef;
   protected compRef: ComponentRef<T>;
 
+  /**
+   * A reference to the themed component. Will start as undefined and emit every time the themed
+   * component is rendered
+   */
+  public compRef$: BehaviorSubject<ComponentRef<T>> = new BehaviorSubject(undefined);
+
   protected lazyLoadSub: Subscription;
   protected themeSub: Subscription;
 
@@ -90,6 +96,7 @@ export abstract class ThemedComponent<T> implements OnInit, OnDestroy, OnChanges
       const factory = this.resolver.resolveComponentFactory(constructor);
       this.compRef = this.vcr.createComponent(factory);
       this.connectInputsAndOutputs();
+      this.compRef$.next(this.compRef);
       this.cdr.markForCheck();
     });
   }
diff --git a/src/themes/custom/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/external-source-entry-import-modal/external-source-entry-import-modal.component.html b/src/themes/custom/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/external-source-entry-import-modal/external-source-entry-import-modal.component.html
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/src/themes/custom/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/external-source-entry-import-modal/external-source-entry-import-modal.component.scss b/src/themes/custom/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/external-source-entry-import-modal/external-source-entry-import-modal.component.scss
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/src/themes/custom/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/external-source-entry-import-modal/external-source-entry-import-modal.component.ts b/src/themes/custom/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/external-source-entry-import-modal/external-source-entry-import-modal.component.ts
new file mode 100644
index 0000000000..cd1de5d159
--- /dev/null
+++ b/src/themes/custom/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/external-source-entry-import-modal/external-source-entry-import-modal.component.ts
@@ -0,0 +1,15 @@
+import {
+  ExternalSourceEntryImportModalComponent as BaseComponent
+} from '../../../../../../../../../../app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/external-source-entry-import-modal/external-source-entry-import-modal.component';
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'ds-external-source-entry-import-modal',
+  styleUrls: ['../../../../../../../../../../app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/external-source-entry-import-modal/external-source-entry-import-modal.component.scss'],
+  // styleUrls: ['./external-source-entry-import-modal.component.scss'],
+  templateUrl: '../../../../../../../../../../app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/external-source-entry-import-modal/external-source-entry-import-modal.component.html',
+  // templateUrl: './external-source-entry-import-modal.component.html'
+})
+export class ExternalSourceEntryImportModalComponent extends BaseComponent {
+
+}
diff --git a/src/themes/custom/lazy-theme.module.ts b/src/themes/custom/lazy-theme.module.ts
index d2ac0ae787..2ff4af7946 100644
--- a/src/themes/custom/lazy-theme.module.ts
+++ b/src/themes/custom/lazy-theme.module.ts
@@ -114,6 +114,9 @@ import { ObjectListComponent } from './app/shared/object-list/object-list.compon
 import { BrowseByMetadataPageComponent } from './app/browse-by/browse-by-metadata-page/browse-by-metadata-page.component';
 import { BrowseByDatePageComponent } from './app/browse-by/browse-by-date-page/browse-by-date-page.component';
 import { BrowseByTitlePageComponent } from './app/browse-by/browse-by-title-page/browse-by-title-page.component';
+import {
+  ExternalSourceEntryImportModalComponent
+} from './app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/external-source-entry-import-modal/external-source-entry-import-modal.component';
 
 const DECLARATIONS = [
   FileSectionComponent,
@@ -168,6 +171,7 @@ const DECLARATIONS = [
   BrowseByMetadataPageComponent,
   BrowseByDatePageComponent,
   BrowseByTitlePageComponent,
+  ExternalSourceEntryImportModalComponent,
 
 
 ];