Message type: E = Error
Message class:  CNV_DMC_SIN - Messages for s-innovations migration 
Message number: 334
Message text: no payment card is flagged as standard payment card
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Change the source value and select the standard payment card indicator
for one single payment card.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV_DMC_SIN334 indicates that there is no payment card flagged as a standard payment card in the system. This error typically arises during data migration or when processing transactions that require a payment card.
Cause: Missing Configuration: The payment card may not be configured correctly in the system. This could mean that the card is not marked as a standard payment card in the relevant settings. Data Migration Issues: If you are migrating data from another system, the payment card information may not have been transferred correctly or completely. User Error: The user may have selected a payment card that is not set up as a standard payment card.
Solution: Check Payment Card Configuration: Navigate to the payment card configuration settings in SAP. Ensure that the payment card you are trying to use is marked as a standard payment card. You can do this by going to the relevant transaction (e.g., FPAYH for payment cards) and
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