How To Fix STGR106 - Plant &1 is already assigned to reference plant &2

SAP Error Message - Details

• Message type: E = Error

• Message class: STGR - Hold store grouping messages

• Message number: 106

• Message text: Plant &1 is already assigned to reference plant &2

What causes this issue?

Plant &V1& is already assigned to reference plant &V2&.

How to fix this error?

You can choose another plant; the help list will indicate you all
available plants.
Otherwhise, if you really want to use the plant you indicated, you
should first unassign the plant from its current reference plant and
after that you can make it new reference plant or you can use Reassign
button to change its reference plant.

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 STGR106 - Plant &1 is already assigned to reference plant &2 ?

  The SAP error message STGR106 indicates that a plant (denoted as &1) is already assigned to a reference plant (denoted as &2). This typically occurs in the context of plant assignments in the SAP system, particularly when dealing with logistics or production planning.
  Cause:
  The error arises when you attempt to assign a plant that is already linked to another reference plant. In SAP, a reference plant is used to define certain characteristics or settings that can be shared among multiple plants. If you try to assign a plant to a reference plant that is already in use, the system will prevent this action to maintain data integrity.
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Existing Assignments:
  
  Use transaction code OX18 (or navigate through the menu: Logistics > Production > Master Data > Plant > Assign Plant to Reference Plant) to view the current assignments of the plants.
  Identify the reference plant that the plant is already assigned to.
  
  
  
  Decide on the Assignment:
  
  If the plant needs to be assigned to a different reference plant, you will need to first remove the existing assignment. This can be done in the same transaction (OX18).
  If the plant should remain assigned to the current reference plant, then no further action is needed.
  
  
  
  Modify Assignments:
  
  If you need to change the assignment, delete the existing assignment and then create a new one for the desired reference plant.
  
  
  
  Consult Documentation:
  
  Review any relevant documentation or guidelines within your organization regarding plant assignments to ensure compliance with business processes.
  
  
  
  Check for Dependencies:
  
  Ensure that there are no dependent configurations or settings that might be affected by changing the plant assignment.
  
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  OX18: Assign Plant to Reference Plant
  SPRO: Access the SAP Reference IMG for configuration settings related to plants and reference plants.
  
  
  
  SAP Notes: 
  
  Check SAP Notes for any known issues or additional guidance related to plant assignments and error STGR106.
  
  
  
  User Roles: 
  
  Ensure that you have the necessary authorizations to make changes to plant assignments in the system.
  
  
  
  Testing: 
  
  After making changes, it is advisable to test the configuration in a development or quality environment before applying it to production.
  
  
  
  By following these steps, you should be able to resolve the STGR106 error and manage plant assignments effectively in your SAP system.