Message type: E = Error
Message class:  FI_E - Message Class for FM English Developers 
Message number: 272
Message text: PO &1 and line item &2 are not referenced on any FP invoice line item
There are no invoice line items that have the Fast Pay indicator set and
use purchase order (PO) &V1& and line item &V2& as PO item reference.
The system does not release invoices that use this PO line item as
reference.
Use PO line items that have been used as reference on invoice line items
with the Fast Pay indicator set
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message FI_E272 indicates that a Purchase Order (PO) and a specific line item are not referenced on any Financial Posting (FP) invoice line item. This error typically arises during the invoice verification process in the SAP system, particularly when trying to post an invoice that is expected to reference a purchase order.
Cause: Missing Reference: The specified PO and line item may not have been referenced in any invoice. This can happen if the invoice is being processed without a corresponding PO or if the PO was not properly linked to the invoice. Incorrect PO Number: The PO number entered may be incorrect or does not exist in the system. Line Item Issues: The specific line item may have been deleted or not included in the invoice. Invoice Type: The type of invoice being processed may not allow for referencing the specified PO. Document Status: The PO may be in a status that
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