Diagnosis
You want to delete a HU for which the confirmation and stock postinghave already been made. Deleting the HU would only change the materialstock in the HU from packed to unpacked. All other actions that affectthe confirmation of the production order or repetitive manufacturing,such as removing components or activity backflushes, cannot be reversed.

Procedure
Cancel the HU in the confirmation for the production order or in theconfirmation for repetitive manufacturing. Only then can you delete theHU using this function.