Some PRs cannot be deleted or copied in the Fiori Application Manage Purchase Requisition Professional.
In Manage Purchase Requisition Professional a user has access to all PR's, whether or not a change can be made or document.
This is determined by the document origin and the status.
So initially, when you call each PR in the worklist, the delete TAB will be active in some cases and not active in others.
So in the APP, you can use this delete TAB to 'Manually created' Purchase Requisitions and to delete documents in a draft status.
For PR's created via SSP (Create Purchase Requisitions) the TAB will be inactive.
For the PR created in Self Service the Advanced Application can be used.
Manage Purchase Requisition Professional, document origin , KBA , MM-FIO-PUR-REQ-PRF , Manage Purchase Requisitions – Professional , Problem