Message type: E = Error
Message class:  IST_EBS - Interface Between IS-T and External Billing System 
Message number: 109
Message text: Application &1 is not permitted for document transfer
You called the function for IS-T document transfer from a billing
system in an external environment. This function is not supported in
the application where you called it from.
The system determined an application that is not 'T'. Therefore
processing was terminated.
You <ZH>cannot</> use the function you require in this environment.
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 IST_EBS109, which states "Application &1 is not permitted for document transfer," typically occurs in the context of Electronic Bank Statement (EBS) processing. This error indicates that the application or document type you are trying to use for the bank statement processing is not allowed or configured correctly in the system.
Cause: Incorrect Configuration: The application type (e.g., accounting document, payment document) is not configured for document transfer in the EBS settings. Document Type Restrictions: The specific document type you are trying to process may not be permitted for the bank statement processing. Missing Authorizations: The user may not have the necessary authorizations to perform the document transfer for the specified application. Custom Development: If there are custom developments or enhancements in the EBS process, they may not be handling the document types correctly.
Solution: Check Configuration: Go to the configuration settings for Electronic Bank Statement in SAP (Transaction code: OBBA or through SPRO). Ensure that
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