How To Fix MD131 - Simulation planned orders cannot be changed manually

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 131

• Message text: Simulation planned orders cannot be changed manually

What causes this issue?

The planned order that was selected is a simulative planned order from
long-term planning.

System Response

Planned orders that are created in long-term planning cannot be changed
or firmed. They are used to check the effects of the simulative demand
program on production and procurement. Thus, a preview is availble of
the planned demand program.
The planned orders are changed or replanned in the operative planning
run.

How to fix this error?

You can only change the simulative planned orders from the results
screen of the long-term, single-item planning.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MD131 - Simulation planned orders cannot be changed manually ?

  The SAP error message MD131, which states "Simulation planned orders cannot be changed manually," typically occurs in the context of production planning and material requirements planning (MRP) within SAP. This error indicates that the planned orders generated during a simulation run cannot be modified directly by users.
  Cause:
  
  Simulation Mode: The planned orders were created as part of a simulation run. In this mode, the system is designed to allow users to analyze the impact of changes without affecting the actual production planning data.
  System Settings: The configuration of the MRP settings may restrict manual changes to simulation orders to prevent inconsistencies in planning data.
  Order Type: The planned orders may be of a specific type that is designated for simulation purposes only.
  
  Solution:
  
  Review Simulation Settings: If you need to make changes to the planned orders, consider running the MRP in a non-simulation mode. This will generate actual planned orders that can be modified.
  Use the Correct Transaction: Ensure you are using the appropriate transaction codes for managing planned orders. For example, use transaction codes like MD04 (Stock/Requirements List) or MD12 (Change Planned Order) for actual planned orders.
  Create New Orders: If you need to adjust the quantities or dates, you may need to create new planned orders based on the simulation results rather than trying to modify the existing simulation orders.
  Consult Documentation: Review SAP documentation or help files related to MRP and planned orders for more detailed guidance on handling simulation orders.
  
  Related Information:
  
  MRP Configuration: Understanding the configuration settings for MRP in your SAP system can help clarify why certain restrictions are in place.
  User Authorizations: Ensure that you have the necessary authorizations to make changes to planned orders, as restrictions may also be related to user roles.
  SAP Notes: Check for any relevant SAP Notes that may address specific issues or provide updates related to planned orders and simulation runs.
  Training and Support: If you are frequently encountering this error, consider seeking additional training on SAP MRP processes or consulting with your SAP support team for tailored assistance.
  
  By following these steps, you should be able to address the MD131 error and manage your planned orders effectively.