How To Fix MD120 - Plant & has already been allocated

SAP Error Message - Details

• Message type: E = Error

• Message class: MD - Material Requirements Planning (MRP)

• Message number: 120

• Message text: Plant & has already been allocated

What causes this issue?

A planning scenario can only be assigned to a plant once.

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?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MD120 - Plant & has already been allocated ?

  The SAP error message MD120 indicates that a plant has already been allocated for a specific material or production order. This error typically arises in the context of Material Requirements Planning (MRP) or production planning processes when there is an attempt to allocate or assign a plant that is already in use for the same material or order.
  Cause:
  
  Duplicate Allocation: The plant is already assigned to another order or process for the same material.
  Configuration Issues: There may be configuration settings in the system that prevent multiple allocations for the same plant.
  Data Integrity Issues: There could be inconsistencies in the master data or transaction data that lead to this error.
  Concurrent Processes: If multiple users or processes are trying to allocate the same plant simultaneously, it can lead to this error.
  
  Solution:
  
  Check Existing Allocations: Review the current allocations for the plant and material in question. You can do this by checking the relevant production orders, stock levels, or MRP runs.
  Release or Change Allocation: If the plant is allocated to another order that is no longer needed, consider releasing it or changing the allocation to a different plant if possible.
  Review Configuration: Check the configuration settings in the SAP system related to plant allocation and MRP settings to ensure they are set up correctly.
  Data Consistency Check: Run data consistency checks to identify any discrepancies in the master data or transaction data that may be causing the issue.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on handling this error in your version of SAP.
  Contact Support: If the issue persists, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  Related Information:
  
  Transaction Codes: You may use transaction codes like MD04 (Stock/Requirements List) or MD05 (Individual Display of MRP List) to analyze the current situation.
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  User Roles: Ensure that the user has the appropriate roles and permissions to perform the allocation actions in the system.
  
  By following these steps, you should be able to identify the root cause of the MD120 error and implement a suitable solution.