Message type: E = Error
Message class:  IUEEDPPLOTA - Deregulation: Distribution of Aggregated Payments 
Message number: 028
Message text: Bill sender &1 does not exist
The system determined that bill sender &SYST-MSGV1& does not exist as a
service provider in the system.
The function cannot be executed.
Enter a valid service provider.
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 IUEEDPPLOTA028 indicates that the bill sender specified in the transaction does not exist in the system. This error typically occurs in the context of billing or invoicing processes, particularly when dealing with electronic invoicing or document processing.
Cause: Non-Existent Sender: The bill sender (identified by the placeholder &1) is not defined in the system. This could be due to a typo in the sender ID or the sender not being created in the relevant master data. Incorrect Configuration: The configuration settings for billing or invoicing may not be set up correctly, leading to the system not recognizing the sender. Data Migration Issues: If data was migrated from another system, the sender information may not have been transferred correctly. Authorization Issues: The user may not have the necessary authorizations to access the sender information.
Solution: Check Sender ID: Verify that the bill sender ID entered in the transaction is correct. Look for any typographical
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