How To Fix MM021 - The unit & is still used as the issue unit for material & in plant &

MM021 - Overview

• Message type: E = Error

• Message class: MM - Messages for material master maintenance and Customizing

• Message number: 021

• Message text: The unit & is still used as the issue unit for material & in plant &

What causes this issue?

The unit of measure &V1& is still used as the
<DS:GLOS.unit_of_issue>unit of issue</> in at least one plant and may
not therefore be deleted.

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?

If you want to delete the unit of measure nevertheless, change the unit
of issue to another unit in the plants concerned.

Error message extract from SAP system. Copyright SAP SE.

MM021 - Details

• The SAP error message MM021 indicates that a specific unit of measure (UoM) is still being used as the issue unit for a material in a particular plant. This typically occurs when you attempt to delete or change the unit of measure in the material master data, but the system prevents this action because the unit is still actively linked to transactions or configurations.
  
  Cause:
  
  Active Transactions: The unit of measure is currently being used in stock movements, purchase orders, sales orders, or other transactions.
  Material Master Configuration: The unit of measure is defined as the issue unit in the material master, and the system does not allow changes if it is still in use.
  Dependencies: There may be dependencies in the configuration or other related master data that prevent the change.
  
  
  Solution:
  To resolve the MM021 error, you can follow these steps:
  
  
  Check Active Transactions:
  
  Review any open purchase orders, sales orders, or stock movements that may