Message type: E = Error
Message class:  FKKINV_ID_XX_ODN - ODN Message in Convergent Invoicing 
Message number: 103
Message text: Source document type &1 is not assigned to source document category &2
You want to change the source document type to &SYST-MSGV1&, but this
document type is not assigned to the source document category.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Processing is canceled.
Make sure that source document type &SYST-MSGV1& is assigned to source
document category &SYST-MSGV2& in Customizing for <LS>Contract Accounts
Receivable and Payable</> under<LS> Convergent Invoicing -> Invoicing ->
Invoicing ->
<DS:SIMG._FICAINV_TFK2605S>Define Source Document Types</></>.
Check the source document type specified in the function module
implementation for event 2737. If necessary, change the source document
type.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message FKKINV_ID_XX_ODN103 indicates that there is an issue with the assignment of a source document type to a source document category in the context of the SAP Convergent Invoicing (CI) module. This error typically arises when the system is trying to process an invoice or a related document, but the document type being used is not properly configured in relation to the expected document category.
Cause: The error is caused by one of the following reasons: Configuration Issue: The source document type (e.g., invoice, credit memo) is not assigned to the appropriate source document category (e.g., billing document, contract) in the system configuration. Missing Customization: The necessary customization for the document type and category relationship has not been set up in the SAP system. Data Entry Error: There may be a mistake in the data entry where an incorrect document type is being used for a specific transaction.
Solution: To resolve this error, you
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