If you wish to prevent a new item in an external purchasing document from being created from a requisition item, you can block the latter.

The requester can block a requisition item in Change Purchase Requisition (ME52N). The block thus imposed is termed the "requester block".

If you wish to block a requisition item in Assign Source of Supply to Requisitions (ME56) or Assign Purchase Requisitions (ME57), you must choose the list variant J or a comparable list variant.

If a requisition item is not to be converted into a new purchasing document item, the requester can block this requisition item in Change Purchase Requisition. To do so, he or she sets the Blocking Indicator on the Status tab page in the detail data for the requisition item to blocked by requester.

This requester block can only be processed by an employee having the authorizations for Change Purchase Requisition.

If a requisition item is blocked, it can be released and a source can be assigned to it, but you cannot create any purchasing documents referencing it.