### **Environment**:

11.3.x

### **Steps to reproduce:**

1. Go to administration.
2. Select "Work packages" > "Types".
3. Delete a type.

### **Actual Behavior**

Generic error message that type cannot be deleted since it is in use.

It is unclear in which projects the work package type is still being used. Especially when there are archived projects, it can be very difficult to find this out.

### **Expected Behavior**

Begin of the insertionMore detailed error message:

* Provide a link to a queryEnd of the insertion Begin of the deletion Error message should name projects inEnd of the deletion which Begin of the insertionlists all WPEnd of the insertion Begin of the deletion work package type is still used soEnd of the deletion that Begin of the insertionuse theEnd of the insertion type Begin of the insertion
* If there are archived projects that use this type, list their names in the error messageEnd of the insertion Begin of the deletion can be deleted.End of the deletion