How To Fix APO_BAPI128 - Incorrect or multiple components have been defined as main products

SAP Error Message - Details

• Message type: E = Error

• Message class: APO_BAPI - Message Class for APO BAPIs

• Message number: 128

• Message text: Incorrect or multiple components have been defined as main products

What causes this issue?

For an order, a maximum of one (receipt) component can be defined as a
main product (IS_MASTER).
In the given case, several components or invalid components (for
example, requirements elements) were specified as main products.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Check if the indicator for the main product is being used correctly in
accordance with the documentation in the given case.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message APO_BAPI128 - Incorrect or multiple components have been defined as main products ?

  The SAP error message APO_BAPI128 indicates that there is an issue with the configuration of main products in the Advanced Planning and Optimization (APO) module. Specifically, it suggests that either an incorrect component has been defined as a main product or that multiple components are incorrectly defined as main products.
  Cause:
  
  Incorrect Configuration: The main product may not be correctly defined in the system. This can happen if the product master data is not set up properly.
  Multiple Main Products: If more than one component is marked as a main product in a product hierarchy or in a specific planning scenario, this error will occur.
  Data Inconsistency: There may be inconsistencies in the data being sent to the BAPI (Business Application Programming Interface) that handles product definitions.
  
  Solution:
  
  
  Check Product Master Data:
  
  Go to the product master data in APO and verify the configuration of the products involved. Ensure that only one product is defined as the main product.
  Use transaction codes like /SAPAPO/MAT1 to check the product master data.
  
  
  
  Review Product Hierarchy:
  
  If you are using product hierarchies, ensure that the hierarchy is correctly set up and that only one product is designated as the main product within that hierarchy.
  
  
  
  Correct BAPI Call:
  
  If you are using a BAPI to create or update product data, ensure that the parameters being passed are correct and that they do not include multiple main products.
  
  
  
  Data Validation:
  
  Validate the data being sent to the BAPI. Ensure that the data structure adheres to the expected format and that there are no duplicates or incorrect entries.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to APO and the specific BAPI you are using for any additional guidance or known issues.
  
  
  
  Testing:
  
  After making corrections, test the changes in a development or quality environment before applying them to production.
  
  
  
  Related Information:
  
  BAPI Documentation: Check the SAP BAPI documentation for details on the parameters and expected data formats.
  SAP Notes: Look for relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Community Forums: Engage with SAP community forums or support channels for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the APO_BAPI128 error and ensure that your product definitions are correctly configured in SAP APO.