Message type: E = Error
Message class:  67_LOAN_PAY - Loans Management: Messages for Payments 
Message number: 031
Message text: Payment data is stored for this flow record - note long text
Payment data and a business partner are stored for the flow record.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
If you would like to define a business partner created in the system as
the payer of the flow, first delete the payment data. Use the <ZK>Alt.
Payer</> button in the entry screen for the payment data to branch to
the detailed data for the flow record and delete the data here. You can
then assign the business partner to the flow as a payer using the
business partner number.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message 67_LOAN_PAY031 typically indicates that there is payment data already stored for a specific flow record in the loan payment processing module. This error can occur in various scenarios, such as when trying to modify or delete a payment record that has already been processed or when attempting to create a new payment entry that conflicts with existing data.
Cause: Existing Payment Data: The primary cause of this error is that there is already payment data associated with the flow record you are trying to work with. This could be due to previous transactions that have been recorded in the system. Data Integrity Constraints: SAP enforces data integrity rules to prevent inconsistencies, and this error is a safeguard against modifying or deleting records that are already linked to payment data. Incorrect Transaction Flow: The error may also arise if the transaction flow is not being followed correctly, leading to attempts to
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