Message type: E = Error
Message class:  WB2_SE_INVC_AGENCY - Message Class for Invoices (Settlement Management) 
Message number: 209
Message text: Invoice refers to TC with different settlement process types
The currently processed invoice item refers to trading contract &V1&,
which has trading contract type &V2&.
The first invoice item refers to trading contract &V3&, which has
trading contract type &V4&.
The trading contract types &V2& and &V4& were created with different
settlement process types.
However, this is not allowed: All trading contracts referred to in an
invoice must have been created for the same settlement process type,
that is, with trading contract types with the same settlement process
type.
Processing of this invoice is not possible.
Ensure that all trading contracts referred to in an invoice have been
created with trading contract types that have the same settlement
process type.
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 WB2_SE_INVC_AGENCY209 indicates that there is a mismatch in the settlement process types for a transaction code (TC) related to an invoice. This typically occurs in the context of settlement management, where the system expects certain consistency in the settlement process types for the transactions being processed.
Cause: The error is usually caused by one of the following reasons: Inconsistent Settlement Process Types: The invoice you are trying to process refers to a transaction that has a different settlement process type than what is expected. This can happen if the transaction was created with a different configuration or if there have been changes in the settlement process settings.
Configuration Issues: There may be configuration settings in the SAP system that are not aligned with the expected settlement processes for the transactions involved. Data Entry Errors: Incorrect data entry when creating the invoice or the related transaction can lead to this error.
Solution: To resolve
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