How To Fix WY155 - Partner function &1 is not available at level &3 in schema &2

SAP Error Message - Details

• Message type: E = Error

• Message class: WY - Supplier Master

• Message number: 155

• Message text: Partner function &1 is not available at level &3 in schema &2

What causes this issue?

Partner function &V1& is assigned to your vendor at level &V3&. Partner
schema &V2& is valid at level &V3& in the new account group &V4& you
selected. Partner function &V1& is not defined in this partner schema.
By changing the account group, partner functions were assigned to your
vendor which are not allowed.

System Response

A change to the account group is not allowed.

How to fix this error?

Please change the partner schemas for the account groups in
Customizing.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WY155 - Partner function &1 is not available at level &3 in schema &2 ?

  Certainly! Here's a detailed explanation of the SAP error message:
  
  SAP Error Message:
  WY155 Partner function &1 is not available at level &3 in schema &2
  
  Meaning / Cause:
  This error occurs during the processing of partner determination in SAP (e.g., in Sales and Distribution (SD), Materials Management (MM), or other modules where partner determination schemas are used). The system is trying to find or assign a partner function (e.g., sold-to party, ship-to party, payer, etc.) at a certain partner determination level within a partner determination procedure (schema), but the partner function is not defined or allowed at that level.
  
  &1 = Partner function (e.g., AG - Sold-to party, WE - Ship-to party)
  &2 = Partner determination procedure/schema (e.g., VPRS, VPRS01)
  &3 = Partner determination level (e.g., header, item)
  
  In other words, the partner function you are trying to assign or use is not configured for the specified level in the partner determination procedure.
  
  Typical Scenarios:
  
  You are creating or changing a sales document, and the system cannot find the required partner function at the header or item level.
  Custom partner functions have been added but not properly assigned in the partner determination procedure.
  Partner determination procedure is incomplete or incorrectly maintained.
  The partner function is being called in a process step where it is not valid.
  
  
  How to Check / Solution:
  
  
  Check Partner Determination Procedure (Schema):
  
  Go to the partner determination procedure configuration and verify the partner functions assigned at each level.
  
  Transaction code:  
  
  SPRO ? Logistics Execution ? Shipping ? Basic Shipping Functions ? Partner Determination ? Define Partner Determination Procedures  
  Or for SD:
  
  SPRO ? Sales and Distribution ? Basic Functions ? Partner Determination ? Set Up Partner Determination  
  Or use transaction VOPA (Partner Determination Procedures) or VOPAN (Partner Functions in Procedures)
  
  
  
  
  
  Verify Partner Functions at Levels:
  
  Check if the partner function (&1) is assigned to the partner determination procedure (&2) at the level (&3) where it is required.
  
  Levels are usually:  
  
  1 = Header level  
  2 = Item level  
  3 = Schedule line level (depending on module)
  
  
  
  
  
  Add Missing Partner Function:
  
  If the partner function is missing at the required level, add it to the partner determination procedure.
  
  
  Check Partner Function Configuration:
  
  Ensure the partner function itself is correctly defined in the system (transaction VOPA).
  
  
  Check Customizing for Partner Determination:
  
  Sometimes, partner determination procedures are copied or customized incorrectly. Make sure the procedure is consistent.
  
  
  Check User Exits or Enhancements:
  
  If custom code is manipulating partner functions, verify that it does not assign partner functions at invalid levels.
  
  
  
  Additional Information:
  
  Partner determination is a key concept in SAP for assigning business partners to documents.
  Partner functions must be maintained properly in the partner determination procedure to avoid such errors.
  This error is common when customizing or extending partner functions or procedures.
  The error message is a safeguard to prevent inconsistent partner assignments.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Cause
  Partner function not assigned at the required level in the partner determination procedure.
  
  
  Solution
  Assign the partner function to the correct level in the partner determination procedure.
  
  
  Transaction(s)
  SPRO, VOPA, VOPAN, VOPA, VOPA, VOPA, VOPA (varies by module)
  
  
  Related Notes
  Check SAP OSS notes for module-specific partner determination issues.
  
  
  
  
  If you provide the exact module or transaction where this error occurs, I can give more tailored instructions.