Message type: E = Error
Message class:  TU - Billing/Scheduling/Budget Billing 
Message number: 214
Message text: Advance payment not permissible on &1
Reasons:
A renewed agreement for advance payment on the specified date would
result in a combination of budget billing - advance payment - budget
billing - advance payment (BB-AP-BB-AP) or of AP-BB-AP. The maximum
possible combination is BB-AP-BB or AP-BB.
No modifiable due date exists after the specified date.
An unmodifiable due date exists after the specified date.
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 TU214, which states "Advance payment not permissible on &1," typically occurs in the context of financial transactions, particularly when dealing with advance payments in the SAP system. This error indicates that the system has detected a condition where an advance payment cannot be processed for the specified document or transaction.
Cause: The error can arise due to several reasons, including: Configuration Settings: The configuration settings in the SAP system may not allow advance payments for certain transaction types or document types. This could be due to settings in the financial accounting (FI) module or the controlling (CO) module. Document Type Restrictions: The document type associated with the transaction may not be configured to allow advance payments. For example, certain invoice types or payment terms may restrict advance payments. Payment Terms: The payment terms defined for the vendor or customer may not permit advance payments. This could be due to specific conditions
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