How To Fix M8013 - Purchase order & already selected (please delete line)

M8013 - Overview

• Message type: E = Error

• Message class: M8 - Invoice Verification/Valuation

• Message number: 013

• Message text: Purchase order & already selected (please delete line)

What causes this issue?

You have selected the same purchase order more than once.

How to fix this error?

Delete the redundant line.

Error message extract from SAP system. Copyright SAP SE.

M8013 - Details

• The SAP error message M8013 ("Purchase order & already selected (please delete line)") typically occurs in the context of materials management and purchasing when there is an attempt to process a purchase order (PO) that has already been selected for a particular operation, such as a goods receipt or invoice verification. This error indicates that the system has detected that the specified line item in the purchase order is already being processed or has been locked for some reason.
  Causes:
  
  Duplicate Selection: The line item in the purchase order has already been selected for processing in another transaction.
  Locked by Another User: Another user may have the purchase order line item locked for editing or processing.
  Incomplete Previous Transaction: A previous transaction involving the same purchase order line item may not have been completed, leaving it in a locked state.
  System 
  Configuration Issues: There may be issues with the configuration of the purchasing module or