Message type: E = Error
Message class:  FI_E - Message Class for FM English Developers 
Message number: 178
Message text: Material group - payment term mismatch for Fast Pay
This purchase order contains one or more Fast Pay relevant items that
have already been processed prior to the current line &V1&.
The material group &V2& to which the material in current line &V1&
belongs is different from the Fast Pay material group &V3&
You cannot post this purchase order because you cannot have one that
has Fast Pay and non-Fast Pay items mixed together.
You should change the material group of the non-Fast Pay materials to
&V3&. The purchase order can then be posted as a Fast Pay purchase
order if the other conditions are met.
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_E178, which indicates a "Material group - payment term mismatch for Fast Pay," typically arises in the context of financial transactions where there is a discrepancy between the material group associated with a purchase order or invoice and the payment terms defined for that material group.
Cause: Material Group Configuration: The material group may not be properly configured with the correct payment terms in the system. Payment Terms Assignment: The payment terms assigned to the vendor or customer may not align with the payment terms expected for the material group. Fast Pay Configuration: The Fast Pay functionality may have specific requirements that are not being met due to the mismatch in payment terms. Master Data Issues: There may be inconsistencies in the master data for the vendor, customer, or material group that lead to this error.
Solution: Check Material Group Settings: Navigate to the configuration settings for the material group in SAP (Transaction Code:
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