How To Fix MD120 - Plant & has already been allocated

MD120 - Overview

• 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.

MD120 - Details

• 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