How To Fix MH257 - Unit & cannot be deleted as used in assignment of matl & to layout mod. &

MH257 - Overview

• Message type: E = Error

• Message class: MH - Maintain Material Master Data (Retail)

• Message number: 257

• Message text: Unit & cannot be deleted as used in assignment of matl & to layout mod. &

What causes this issue?

You wanted to delete the unit of measure &V1&. This is not possible
because it is still used in the assignment of material &V2& to layout
module &V3&.
<ZH>Note</>
If you are maintaining a generic material, this message is also issued
if the unit of measure is used in a material variant for assignment to
a layout module.

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?

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 MH257 - Unit & cannot be deleted as used in assignment of matl & to layout mod. & ?

  The SAP error message MH257 indicates that a specific unit of measure (UoM) cannot be deleted because it is currently being used in an assignment of a material to a layout module. This typically occurs in the context of SAP's Warehouse Management (WM) or Extended Warehouse Management (EWM) modules, where materials are assigned to specific layout modules for storage and handling.
  
  Cause:
  
  Active Assignments: The unit of measure you are trying to delete is actively assigned to one or more materials in the system.
  Dependencies: There may be dependencies or references in other configurations or transactions that prevent the deletion of the unit of measure.
  Data Integrity: SAP enforces data integrity rules to ensure that no critical data is lost or corrupted, which is why it prevents the deletion of UoMs that are in use.
  
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check Assignments:
  
  Use transaction codes like MM03 (Display Material) to check if the