### **Environment**:

Your OpenProject Version:1.3.3 / Cloud Edition

Operating System / Browser / OpenProject Begin of the insertionlanguage:End of the insertion Begin of the deletion language: End of the deletion

### **Logs**

Moving a workpackage by REST Interface: Begin of the insertion    

```JSON
 {"parent": 
{"_type": "Error", 
"errorIdentifier": "urn:openproject-org:api:v3:errors:PropertyConstraintViolation", 
"message": "Parent is invalid because the work package 'UINT32 pointer changes to real pointer' is a backlog task and therefore cannot have a parent outside of the current project.", 
"_embedded": 
{"details": 
{"attribute": "parent"}
}
}
}
```


End of the insertion Begin of the deletion      {"parent": {"\_type": "Error", "errorIdentifier": "urn:openproject-org:api:v3:errors:PropertyConstraintViolation", "message": "Parent is invalid because the work package 'UINT32 pointer changes to real pointer' is a backlog task and therefore cannot have a parent outside of the current project.", "\_embedded": {"details": {"attribute": "parent"}}}}
End of the deletion On Website only an error message (not possible) without any reason

No Version and no backlog for this project

### **Steps to reproduce:**

1. Move Workpackage to another project

### **Actual Behavior**

Not moving

### **Expected Behavior**

Moved to the other project