How to Delete a requisition already submitted in SAGE

Hi Team, we recently entered two requisitions for the same product and constantly enter requisitions with wrong data than then needs to be edited, I am following what the SAGE300ERP Purchase Orders users guide says about going to same requisition entry option, as it seems to be the transaction where we could delete it, but I am getting instead an error when entering the requisition number on the top it says ** Invalid Input. Requisition xxxxxx is not available for viewing*** pic attached. this is in general happening to every requisition.

perhaps anyone can let me know what we are doing wrong.

thank you