diff --git a/src/modules/manager/workflowTemplates/components/CapabilityEditors/AssigneesOfITaskAssigneeEditor.tsx b/src/modules/manager/workflowTemplates/components/CapabilityEditors/AssigneesOfITaskAssigneeEditor.tsx
index e53d090..a426375 100644
--- a/src/modules/manager/workflowTemplates/components/CapabilityEditors/AssigneesOfITaskAssigneeEditor.tsx
+++ b/src/modules/manager/workflowTemplates/components/CapabilityEditors/AssigneesOfITaskAssigneeEditor.tsx
@@ -171,14 +171,14 @@ export const AssigneesOfITaskAssigneeEditor: React.FC<CapabilityEditorProps> = (
 const runValidation = (
   task: TaskDefinition,
   tasks: TaskDefinition[],
-): Record<string, string> => {
+): Promise<Record<string, string>> => {
   const errors: Record<string, string> = {};
   const guid = task.config.guid as string;
   const assignees = task.config.assignees as ITaskAssignee[] | undefined;
 
   if (!assignees || assignees.length === 0) {
     errors[`${guid}.assignees`] = "At least one assignee is required.";
-    return errors;
+    return Promise.resolve(errors);
   }
 
   assignees.forEach((a, i) => {
diff --git a/src/modules/manager/workflowTemplates/components/CapabilityEditors/BudgetEditorRegistryEntry.tsx b/src/modules/manager/workflowTemplates/components/CapabilityEditors/BudgetEditorRegistryEntry.tsx
index c794614..16918b6 100644
--- a/src/modules/manager/workflowTemplates/components/CapabilityEditors/BudgetEditorRegistryEntry.tsx
+++ b/src/modules/manager/workflowTemplates/components/CapabilityEditors/BudgetEditorRegistryEntry.tsx
@@ -69,10 +69,10 @@ export const BudgetEditor: React.FC<CapabilityEditorProps> = (props) => {
 const runValidation = (
   task: TaskDefinition,
   tasks: TaskDefinition[],
-): Record<string, string> => {
+): Promise<Record<string, string>> => {
   const errors: Record<string, string> = {};
 
-  return errors;
+  return Promise.resolve(errors);
 };
 
 export function defaultsAssignment(
diff --git a/src/modules/manager/workflowTemplates/components/CapabilityEditors/BypassableEditor.tsx b/src/modules/manager/workflowTemplates/components/CapabilityEditors/BypassableEditor.tsx
index a35741b..ea72fac 100644
--- a/src/modules/manager/workflowTemplates/components/CapabilityEditors/BypassableEditor.tsx
+++ b/src/modules/manager/workflowTemplates/components/CapabilityEditors/BypassableEditor.tsx
@@ -27,10 +27,10 @@ export const BypassableEditor: React.FC<CapabilityEditorProps> = (props) => {
 const runValidation = (
   task: TaskDefinition,
   tasks: TaskDefinition[],
-): Record<string, string> => {
+): Promise<Record<string, string>> => {
   const errors: Record<string, string> = {};
 
-  return errors;
+  return Promise.resolve(errors);
 };
 
 export function defaultsAssignment(
diff --git a/src/modules/manager/workflowTemplates/components/CapabilityEditors/OutcomeOfApprovalVerdictRegistryEntry.tsx b/src/modules/manager/workflowTemplates/components/CapabilityEditors/OutcomeOfApprovalVerdictRegistryEntry.tsx
index 02639da..00afd7b 100644
--- a/src/modules/manager/workflowTemplates/components/CapabilityEditors/OutcomeOfApprovalVerdictRegistryEntry.tsx
+++ b/src/modules/manager/workflowTemplates/components/CapabilityEditors/OutcomeOfApprovalVerdictRegistryEntry.tsx
@@ -152,7 +152,7 @@ export const outcomeEditor: React.FC<CapabilityEditorProps> = (props) => {
 const runValidation = (
   task: TaskDefinition,
   tasks: TaskDefinition[],
-): Record<string, string> => {
+): Promise<Record<string, string>> => {
   const errors: Record<string, string> = {};
   const guid = task.config.guid as string;
   const outcomeActions =
@@ -160,7 +160,7 @@ const runValidation = (
 
   if (!outcomeActions) {
     // No outcome actions is valid, it just means there are no outcomes configured
-    return errors;
+    return Promise.resolve(errors);
   }
 
   // --- Rule 1: Task must be selected ---
@@ -190,7 +190,7 @@ const runValidation = (
     }
   });
 
-  return errors;
+  return Promise.resolve(errors);
 };
 
 export function defaultsAssignment(
diff --git a/src/modules/manager/workflowTemplates/components/CapabilityEditors/StageOfGeneralTaskEditor.tsx b/src/modules/manager/workflowTemplates/components/CapabilityEditors/StageOfGeneralTaskEditor.tsx
index c63439b..3623901 100644
--- a/src/modules/manager/workflowTemplates/components/CapabilityEditors/StageOfGeneralTaskEditor.tsx
+++ b/src/modules/manager/workflowTemplates/components/CapabilityEditors/StageOfGeneralTaskEditor.tsx
@@ -31,7 +31,7 @@ export const StageOfGeneralTaskEditor: React.FC<CapabilityEditorProps> = (
 
   const runDefaults = useCapabilityDefaults(tasksMetadata);
 
-  const handleAddTask = (selectedType: TaskMetadata) => {
+  const handleAddTask = async (selectedType: TaskMetadata) => {
     const newTask: TaskDefinition = {
       type: selectedType.taskType,
 
@@ -48,14 +48,12 @@ export const StageOfGeneralTaskEditor: React.FC<CapabilityEditorProps> = (
     });
 
     const updatedTasks = [...childTasks, newTask];
-    const errors = validateTask(newTask, updatedTasks, tasksMetadata);
+    const errors = await validateTask(newTask, updatedTasks, tasksMetadata);
 
     const isValid = Object.keys(errors).length === 0;
 
     task.config.tasks = updatedTasks;
 
-    onValidate({ errors: errors, isValid: isValid } as TaskValidationResult);
-
     onChange(task);
   };
 
@@ -66,12 +64,28 @@ export const StageOfGeneralTaskEditor: React.FC<CapabilityEditorProps> = (
   );
 };
 
-const runValidation = (
+const runValidation = async (
   task: TaskDefinition,
   tasks: TaskDefinition[],
-): Record<string, string> => {
+): Promise<Record<string, string>> => {
   const errors: Record<string, string> = {};
 
+  const meta = await templateVersionsService.getTaskMetadata("GeneralTask");
+
+  if (task.config.tasks) {
+    for (const childTask of task.config.tasks as TaskDefinition[]) {
+      const childErrors = await validateTask(
+        childTask,
+        task.config.tasks as TaskDefinition[],
+        meta,
+      );
+
+      if (childErrors && Object.keys(childErrors).length > 0) {
+        errors[`${task.config.guid}.tasks`] =
+          `One or more child tasks are invalid.`;
+      }
+    }
+  }
   return errors;
 };
 
diff --git a/src/modules/manager/workflowTemplates/components/CapabilityEditors/TagsEditor.tsx b/src/modules/manager/workflowTemplates/components/CapabilityEditors/TagsEditor.tsx
index 3833d7c..2a9c626 100644
--- a/src/modules/manager/workflowTemplates/components/CapabilityEditors/TagsEditor.tsx
+++ b/src/modules/manager/workflowTemplates/components/CapabilityEditors/TagsEditor.tsx
@@ -27,10 +27,10 @@ export const TagsEditor: React.FC<CapabilityEditorProps> = (props) => {
 const runValidation = (
   task: TaskDefinition,
   tasks: TaskDefinition[],
-): Record<string, string> => {
+): Promise<Record<string, string>> => {
   const errors: Record<string, string> = {};
 
-  return errors;
+  return Promise.resolve(errors);
 };
 
 export function defaultsAssignment(
diff --git a/src/modules/manager/workflowTemplates/components/CapabilityEditors/TaskCoreEditor.tsx b/src/modules/manager/workflowTemplates/components/CapabilityEditors/TaskCoreEditor.tsx
index dda1829..6c4d9c8 100644
--- a/src/modules/manager/workflowTemplates/components/CapabilityEditors/TaskCoreEditor.tsx
+++ b/src/modules/manager/workflowTemplates/components/CapabilityEditors/TaskCoreEditor.tsx
@@ -120,7 +120,7 @@ export const TaskCoreEditor: React.FC<CapabilityEditorProps> = (props) => {
 const runValidation = (
   task: TaskDefinition,
   tasks: TaskDefinition[],
-): Record<string, string> => {
+): Promise<Record<string, string>> => {
   const errors: Record<string, string> = {};
 
   if (!(task.config.name as string)?.trim()) {
@@ -156,7 +156,7 @@ const runValidation = (
     }
   }
 
-  return errors;
+  return Promise.resolve(errors);
 };
 
 export function defaultsAssignment(
diff --git a/src/modules/manager/workflowTemplates/components/TasksEditor.tsx b/src/modules/manager/workflowTemplates/components/TasksEditor.tsx
index 214aafe..a63e9b7 100644
--- a/src/modules/manager/workflowTemplates/components/TasksEditor.tsx
+++ b/src/modules/manager/workflowTemplates/components/TasksEditor.tsx
@@ -41,12 +41,16 @@ const TaskEditorComponent: React.FC<TaskEditorProps> = ({
   );
 
   const runValidation = useCallback(
-    (
+    async (
       taskToValidate: TaskDefinition,
       tasksList: TaskDefinition[],
       tasksMetadataList: TaskMetadata[],
     ) => {
-      const errors = validateTask(taskToValidate, tasksList, tasksMetadataList);
+      const errors = await validateTask(
+        taskToValidate,
+        tasksList,
+        tasksMetadataList,
+      );
       setFieldErrors(errors);
       onValidate(
         taskToValidate.config.guid as string,
diff --git a/src/modules/manager/workflowTemplates/components/useCapabilityDefaults.tsx b/src/modules/manager/workflowTemplates/components/useCapabilityDefaults.tsx
index 2eeb6eb..14ce243 100644
--- a/src/modules/manager/workflowTemplates/components/useCapabilityDefaults.tsx
+++ b/src/modules/manager/workflowTemplates/components/useCapabilityDefaults.tsx
@@ -36,14 +36,14 @@ export interface capabilityEditorRegistryEntry {
     task: TaskDefinition,
     tasks: TaskDefinition[],
     tasksMetadata: TaskMetadata[],
-  ) => Record<string, string>;
+  ) => Promise<Record<string, string>>;
 }
 
-export function validateTask(
+export async function validateTask(
   task: TaskDefinition,
   tasks: TaskDefinition[],
   tasksMetadata: TaskMetadata[],
-): Record<string, string> {
+): Promise<Record<string, string>> {
   const taskMeta = tasksMetadata.find((t) => t.taskType === task.type);
 
   const errors: Record<string, string> = {};
@@ -55,7 +55,7 @@ export function validateTask(
       continue;
     }
 
-    const validationErrors = entry.ValidationRunner(task, tasks);
+    const validationErrors = await entry.ValidationRunner(task, tasks);
     Object.assign(errors, validationErrors);
   }
   return errors;