Message type: E = Error
Message class:  CRM_PS_4S_BRFP - Message Class for Social Services BRF+ integration 
Message number: 317
Message text: Partner function &1 with same expression already existing
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The SAP error message CRM_PS_4S_BRFP317 indicates that there is a duplicate partner function assignment in the system. This typically occurs when you are trying to assign a partner function to a business partner (BP) or a customer relationship management (CRM) object, and the system detects that the same partner function is already assigned with the same expression.
Cause: Duplicate Assignment: The most common cause is that the partner function you are trying to assign already exists for the same business partner or CRM object.
Configuration Issues: There may be issues in the configuration of partner functions or the way they are defined in the system. Data Entry Errors: Manual data entry errors can lead to attempts to create duplicate entries.
Solution: Check Existing Partner Functions: Navigate to the relevant business partner or CRM object and check the existing partner functions assigned. Ensure that the partner function you are trying to add does not already exist. Modify or
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