How To Fix OQ_B251 - Material &1 is already assigned to business type &2

SAP Error Message - Details

• Message type: E = Error

• Message class: OQ_B - IS-Oil SSR : Message pool Service Station Base

• Message number: 251

• Message text: Material &1 is already assigned to business type &2

What causes this issue?

You tried to change the material handling group. The new material
handling group contains material &V1& , which is also assigned to
material handling group &V3& , which is assigned to the same location
at business type &V2&.
Only one material can be assigned to a business type at a location.

System Response

The system does not accept the change that was made.

How to fix this error?

Assign a different material handling group (i.e. different than the one
you used already), or change the assigned materials for the material
handling group with transaction O3RAM1.

Procedure for System Administrators

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.

Smart SAP Assistant

• What is the cause and solution for SAP error message OQ_B251 - Material &1 is already assigned to business type &2 ?

  The SAP error message OQ_B251 indicates that a specific material (denoted by &1) is already assigned to a particular business type (denoted by &2). This error typically arises in the context of material management or inventory management processes within SAP, particularly when trying to assign a material to a business type that it is already associated with.
  Cause:
  
  Duplicate Assignment: The primary cause of this error is that the material you are trying to assign is already linked to the specified business type. This can happen if the assignment was made previously and you are attempting to make the same assignment again.
  Configuration Issues: There may be configuration settings in the system that prevent multiple assignments of the same material to the same business type.
  Data Integrity: The system is designed to maintain data integrity, and this error is a safeguard against unintentional duplicate entries.
  
  Solution:
  
  Check Existing Assignments: Before attempting to assign the material to the business type, check the existing assignments. You can do this by navigating to the relevant transaction in SAP (e.g., MM02 for material master data) and reviewing the current assignments for the material.
  Modify Existing Assignment: If you need to change the business type for the material, you may need to first remove the existing assignment before making a new one. This can typically be done in the material master data maintenance transaction.
  Consult Documentation: Review the SAP documentation or help files related to material assignments and business types to ensure you are following the correct procedures.
  Contact Support: If you are unsure about how to proceed or if the error persists despite following the above steps, consider reaching out to your SAP support team or consulting with an SAP expert.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MM01 (Create Material), MM02 (Change Material), and MM03 (Display Material) to manage material assignments effectively.
  Business Types: Understand the different business types in your organization and how they relate to materials. This knowledge can help you avoid conflicts and errors in the future.
  SAP Notes: Check for any SAP Notes related to this error message, as they may provide additional insights or patches that could resolve the issue.
  
  By following these steps, you should be able to address the OQ_B251 error and manage material assignments effectively in your SAP system.