How To Fix WPOC007 - Invoices already exist for purchase order &, item &

SAP Error Message - Details

• Message type: E = Error

• Message class: WPOC - Messages for Package WPOC

• Message number: 007

• Message text: Invoices already exist for purchase order &, item &

Self-Explanatory Message

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• What is the cause and solution for SAP error message WPOC007 - Invoices already exist for purchase order &, item & ?

  SAP Error Message:
  WPOC007 – Invoices already exist for purchase order &, item &
  
  
  Cause:
  This error occurs when you try to post an invoice for a purchase order (PO) item for which an invoice has already been posted. Essentially, the system detects that an invoice document already exists for the specified PO and item, and it prevents duplicate invoicing to avoid double payments.
  
  Explanation:
  
  In SAP MM (Materials Management), when you create an invoice for a PO item, the system records the invoice reference.
  If you attempt to post another invoice for the same PO item that has already been invoiced (and the invoice quantity or amount exceeds the PO item quantity or agreed terms), SAP throws this error.
  This is a control mechanism to prevent duplicate or over-invoicing.
  
  
  
  Solution:
  
  
  Check Existing Invoices:
  
  Use transaction MIRO or MB03 to check if an invoice has already been posted for the PO and item.
  Review the invoice documents linked to the PO