Message type: E = Error
Message class:  FKK_SEPA - FI-CA: SEPA Mandate Management 
Message number: 086
Message text: No valid mandate could be determined for partner &1
There are mandates for business partner &V1&. However, none of the
mandates are valid for the specified criteria.
The system issues a warning message.
If the error occurs in a dialog transaction and the mandate reference is
available as an input field, use the input help (F4) to display the
checked mandates and change them as necessary or create a new mandate.
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 FKK_SEPA086 indicates that the system could not find a valid mandate for the specified partner (customer or vendor) when processing a SEPA (Single Euro Payments Area) transaction. This error typically arises in the context of direct debit transactions where a mandate is required to authorize the payment.
Cause: Missing Mandate: The most common cause is that there is no mandate created for the partner in the system. Expired Mandate: The mandate may exist but could be expired or not valid for the current transaction. Incorrect Partner Data: The partner data (such as the customer or vendor number) may be incorrect or not properly linked to the mandate. Mandate Status: The mandate might be in a status that does not allow it to be used (e.g., inactive).
Configuration Issues: There may be configuration issues in the SEPA settings or in the payment processing settings.
Solution: Check Mandate Creation: Verify if a mandate has been created
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