diff --git a/dmp-backend/web/src/main/java/eu/eudat/logic/proxy/fetching/RemoteFetcher.java b/dmp-backend/web/src/main/java/eu/eudat/logic/proxy/fetching/RemoteFetcher.java
index efc0b1db4..f3a416982 100644
--- a/dmp-backend/web/src/main/java/eu/eudat/logic/proxy/fetching/RemoteFetcher.java
+++ b/dmp-backend/web/src/main/java/eu/eudat/logic/proxy/fetching/RemoteFetcher.java
@@ -138,7 +138,7 @@ public class RemoteFetcher {
 
     private void ifFunderQueryExist(UrlConfiguration urlConfiguration, ExternalUrlCriteria externalUrlCriteria) {
         if (urlConfiguration.getFunderQuery() != null) {
-            if (externalUrlCriteria.getFunderId() != null && urlConfiguration.getFunderQuery().startsWith("dmp:")) {
+            if (externalUrlCriteria.getFunderId() != null && !urlConfiguration.getFunderQuery().startsWith("dmp:")) {
                 urlConfiguration.setUrl(urlConfiguration.getUrl().replace("{funderQuery}", urlConfiguration.getFunderQuery()));
             }
             else {
diff --git a/dmp-backend/web/src/main/java/eu/eudat/models/data/dmp/Researcher.java b/dmp-backend/web/src/main/java/eu/eudat/models/data/dmp/Researcher.java
index 9cf079480..c610c92e6 100644
--- a/dmp-backend/web/src/main/java/eu/eudat/models/data/dmp/Researcher.java
+++ b/dmp-backend/web/src/main/java/eu/eudat/models/data/dmp/Researcher.java
@@ -74,10 +74,10 @@ public class Researcher implements DataModel<eu.eudat.data.entities.Researcher,
     @Override
     public eu.eudat.data.entities.Researcher toDataModel() {
         eu.eudat.data.entities.Researcher researcher = new eu.eudat.data.entities.Researcher();
-        if (this.tag.equals("Internal") || this.tag.equals(this.id.substring(0, this.tag.length()))) {
+        if (this.tag.toLowerCase().equals("internal") || this.tag.equals(this.id.substring(0, this.tag.length()))) {
             researcher.setReference(this.id);
         } else {
-            researcher.setReference(this.tag + ":" + this.id);
+            researcher.setReference(this.tag.toLowerCase() + ":" + this.id);
         }
         researcher.setLabel(this.name);
         researcher.setUri(this.label);
diff --git a/dmp-frontend/src/app/ui/dmp/editor/add-researcher/add-researcher.component.html b/dmp-frontend/src/app/ui/dmp/editor/add-researcher/add-researcher.component.html
index 34133f7ad..acdcdbf46 100644
--- a/dmp-frontend/src/app/ui/dmp/editor/add-researcher/add-researcher.component.html
+++ b/dmp-frontend/src/app/ui/dmp/editor/add-researcher/add-researcher.component.html
@@ -12,7 +12,7 @@
 		<div class="col-12">
 			<div class="row">
 				<div class="ml-auto col-auto"><button mat-raised-button mat-dialog-close type="button">Cancel</button></div>
-				<div class="col-auto"><button mat-raised-button color="primary" (click)="addResearcher()" type="button">Save</button></div>
+				<div class="col-auto"><button mat-raised-button [disabled]="!isFormValid()" color="primary" (click)="addResearcher()" type="button">Save</button></div>
 			</div>
 		</div>
 	</div>
diff --git a/dmp-frontend/src/app/ui/dmp/editor/add-researcher/add-researcher.component.ts b/dmp-frontend/src/app/ui/dmp/editor/add-researcher/add-researcher.component.ts
index 08d3940aa..7d677020e 100644
--- a/dmp-frontend/src/app/ui/dmp/editor/add-researcher/add-researcher.component.ts
+++ b/dmp-frontend/src/app/ui/dmp/editor/add-researcher/add-researcher.component.ts
@@ -37,4 +37,8 @@ export class AddResearcherComponent extends BaseComponent implements OnInit {
 	addResearcher() {
 		this.dialogRef.close(this.formGroup.value);
 	}
+
+	isFormValid() {
+		return this.formGroup.valid;
+	}
 }
diff --git a/dmp-frontend/src/app/ui/dmp/editor/add-researcher/add-researcher.model.ts b/dmp-frontend/src/app/ui/dmp/editor/add-researcher/add-researcher.model.ts
index 529a0bb3d..a5fa6df33 100644
--- a/dmp-frontend/src/app/ui/dmp/editor/add-researcher/add-researcher.model.ts
+++ b/dmp-frontend/src/app/ui/dmp/editor/add-researcher/add-researcher.model.ts
@@ -1,5 +1,8 @@
 import { FormBuilder, FormGroup } from '@angular/forms';
 import { ResearcherModel } from '../../../../core/model/researcher/researcher';
+import { ValidationContext } from "../../../../common/forms/validation/validation-context";
+import { BackendErrorValidator } from "../../../../common/forms/validation/custom-validator";
+import { ValidationErrorModel } from "../../../../common/forms/validation/error-model/validation-error-model";
 
 export class ResearcherEditorModel {
 	public id: String;
@@ -7,6 +10,7 @@ export class ResearcherEditorModel {
 	public lastName: String;
 	public uri: String;
 	public email: String;
+	public validationErrorModel: ValidationErrorModel = new ValidationErrorModel();
 
 	fromModel(item: ResearcherModel): ResearcherEditorModel {
 		this.id = item.id;
@@ -17,13 +21,20 @@ export class ResearcherEditorModel {
 		return this;
 	}
 
-	buildForm(): FormGroup {
+	buildForm(context: ValidationContext = null, disabled: boolean = false): FormGroup {
+		if (context == null) { context = this.createValidationContext(); }
 		const formGroup = new FormBuilder().group({
-			firstName: [this.name],
-			lastName: [this.lastName]
+			firstName: [{ value: this.name, disabled: disabled }, context.getValidation('firstName').validators],
+			lastName: [{ value: this.lastName, disabled: disabled }, context.getValidation('lastName').validators]
 		});
 
 		return formGroup;
 	}
 
+	createValidationContext(): ValidationContext {
+		const baseContext: ValidationContext = new ValidationContext();
+		baseContext.validation.push({ key: 'firstName', validators: [BackendErrorValidator(this.validationErrorModel, 'firstName')] });
+		baseContext.validation.push({ key: 'lastName', validators: [BackendErrorValidator(this.validationErrorModel, 'lastName')] });
+		return baseContext;
+	}
 }
diff --git a/dmp-frontend/src/app/ui/dmp/editor/general-tab/general-tab.component.ts b/dmp-frontend/src/app/ui/dmp/editor/general-tab/general-tab.component.ts
index 817786f8b..d678e2dab 100644
--- a/dmp-frontend/src/app/ui/dmp/editor/general-tab/general-tab.component.ts
+++ b/dmp-frontend/src/app/ui/dmp/editor/general-tab/general-tab.component.ts
@@ -154,7 +154,7 @@ export class GeneralTabComponent extends BaseComponent implements OnInit {
 					name: fullName,
 					id: "dmp:" + fullName,
 					status: 0,
-					tag: null,
+					tag: "Internal",
 				});
 			}
 		});