Message type: E = Error
Message class:  FKKBIX2 - Billing in Contract Accounts Receivable and Payable 
Message number: 113
Message text: Your selection contains items of multiple contr. accounts/bus. partners
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The SAP error message FKKBIX2113, which states "Your selection contains items of multiple contr. accounts/bus. partners," typically occurs in the context of financial transactions, particularly when dealing with account postings or reports that involve multiple controlling accounts or business partners. This error indicates that the selection criteria you have used for a report or transaction includes items that belong to different controlling accounts or business partners, which is not allowed in certain operations.
Cause: Multiple Controlling Accounts: The selection criteria may include transactions that are associated with different controlling accounts. In SAP, certain reports or transactions require that all selected items belong to the same controlling account. Multiple Business Partners: Similarly, if the selection includes items related to different business partners, this can trigger the error. The system expects a single business partner for certain operations. Incorrect Selection Criteria: The criteria used for filtering the data may not be specific enough, leading to the
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