diff --git a/so-monitoring/so-monitoring-ui/src/main/frontend/src/app/data.service.ts b/so-monitoring/so-monitoring-ui/src/main/frontend/src/app/data.service.ts
index 7967390..2e8f423 100644
--- a/so-monitoring/so-monitoring-ui/src/main/frontend/src/app/data.service.ts
+++ b/so-monitoring/so-monitoring-ui/src/main/frontend/src/app/data.service.ts
@@ -30,6 +30,7 @@
 import { HttpResponse } from '@angular/common/http';
 import { PII } from './model/processInstance.model';
 import { HttpErrorHandlerService } from './http-error-handler.service';
+import { ACTINST } from './model/activityInstance.model';
 
 
 @Injectable({
@@ -59,12 +60,12 @@
   }
 
   // HTTP GET to return Activity instancs using ProcessInstanceID
-  getActivityInstance(processInstanceId) {
+  getActivityInstance(processInstanceId): Promise<ACTINST[]> {
     var url = environment.soMonitoringBackendURL + 'activity-instance/' + processInstanceId;
-    return this.http.get(url)
+    return this.http.get<ACTINST[]>(url)
       .pipe(
         catchError(this.httpErrorHandlerService.handleError("GET", url))
-      );
+      ).toPromise();
   }
 
   // HTTP GET to return Activity Instance using ProcessInstanceID
diff --git a/so-monitoring/so-monitoring-ui/src/main/frontend/src/app/details/details.component.ts b/so-monitoring/so-monitoring-ui/src/main/frontend/src/app/details/details.component.ts
index 4c19ba1..bb464a9 100644
--- a/so-monitoring/so-monitoring-ui/src/main/frontend/src/app/details/details.component.ts
+++ b/so-monitoring/so-monitoring-ui/src/main/frontend/src/app/details/details.component.ts
@@ -43,7 +43,6 @@
 })
 
 export class DetailsComponent implements OnInit {
-
   bpmnViewer: any;
 
   processInstanceID: string;
@@ -67,8 +66,8 @@
   constructor(private route: ActivatedRoute, private data: DataService, private popup: ToastrNotificationService,
     private router: Router, private spinner: NgxSpinnerService) { }
 
-  getActInst(procInstId: string) {
-    this.data.getActivityInstance(procInstId).subscribe(
+  async getActInst(procInstId: string) {
+    await this.data.getActivityInstance(procInstId).then(
       (data: ACTINST[]) => {
         this.activityInstance = data;
         console.log(data);
@@ -90,7 +89,7 @@
       });
   }
 
-  async  getProcInstance(procInstId) {
+  async getProcInstance(procInstId) {
     await this.data.getProcessInstance(procInstId).then(
       async (data: PII) => {
         this.processInstance = data;
@@ -160,4 +159,5 @@
         this.getVarInst(this.processInstanceID);
       });
   }
+
 }