Forbidding delete PO when its GR IV was completed,  how can I  realize it?

somebody delete the PO item after  it finished  GR and IV actions, and SAP did not show any warning or error message,  but this is not allowed in my company, how can I prevent the occurrence of these things ? and how can I set the system to make it show message when somebody delete PO in same condition?

- restrict it via authorization. Dont give the user authorization for deletion activity.
- restrict it with a check in an userexit
- ask the user why he does such things ... maybe he has a reason that was not discussed during the design.
but think about data archiving. a deletion indicator is precondition for an archiving run.
The first step of  archiving  purchasing documents is to set this deletion indicator.
If you develope the userexit, then think about this, otherwise you will never be able to archive purchasing documents.

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