How To Fix O3188 - Conversion group cannot be changed because of posted stock

O3188 - Overview

• Message type: E = Error

• Message class: O3 - IS-Oil: HPM messages (goods movements, QCI, deliveries)

• Message number: 188

• Message text: Conversion group cannot be changed because of posted stock

What causes this issue?

You attempted to remove the conversion group for the material which
already had a conversion group assigned, or you attempted to enter a
conversion group for a material which previously had no conversion
group assigned, but that is not allowed once stock has been posted to
the material at any of the plants.

System Response

The system will change the conversion group back to its original value.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message O3188 - Conversion group cannot be changed because of posted stock ?

  The SAP error message O3188 indicates that a conversion group cannot be changed due to posted stock. This typically occurs in the context of material management and inventory management when you attempt to change the conversion group for a material that already has stock posted against it.
  
  Cause:
  
  Posted Stock: The primary reason for this error is that there are existing stock postings for the material in question. The conversion group is used to define how quantities of materials are converted between different units of measure. If stock has already been posted, changing the conversion group could lead to inconsistencies in inventory records.
  Material Master Data: The conversion group is part of the material master data. If you try to change it while there are existing transactions (like goods receipts, goods issues, or stock transfers) that reference the material, SAP will prevent the change to maintain data integrity.
  
  
  Solution:
  
  Check Stock Levels: Before attempting to