Diagnosis
You are trying to assign a status (for example, delete logically) to anexisting item that you have changed. Howver, you cannot assign thisstatus due to stock check routines.

Procedure
If you want to delete the item anyway, you either have to enter theoriginal values for the item:
Resource : &V1&
Quantity : &V2&
Unit of measure: &V3&
Activity type : &V4&
or save the document (provided that all the check routines have takenplace successfully), call it up again and then perform the desiredfunction.