How To Fix CO591 - Sequences in order & cannot be exchanged

SAP Error Message - Details

• Message type: E = Error

• Message class: CO - PPC order processing messages

• Message number: 591

• Message text: Sequences in order & cannot be exchanged

What causes this issue?

To exchange a sequence the following conditions must be fulfilled:
You allow alternative sequences to be swapped by selecting an indicator
in Customizing.
The branch operation and the return operation given for the alternative
operation must exist in the main sequence.
The operation numbers given in the alternative operation must fit in
the number interval in the main sequence.
The alternative sequence may not cross over other alternative or
parallel sequences.
The operations in the standard sequence to be exchanged must not have
been released.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CO591 - Sequences in order & cannot be exchanged ?

  The SAP error message CO591, which states "Sequences in order & cannot be exchanged," typically occurs in the context of production order processing, particularly when dealing with operations that have a defined sequence. This error indicates that the system has detected an attempt to change the sequence of operations in a way that is not allowed due to dependencies or constraints defined in the production order.
  Cause:
  
  Operation Dependencies: The operations in the production order may have dependencies that dictate a specific sequence. For example, certain operations must be completed before others can start.
  Routing Configuration: The routing for the production order may have been set up in such a way that it enforces a strict sequence of operations.
  Production Order Status: The status of the production order may not allow for changes to the sequence of operations. For instance, if the order is already in process or completed, changes may be restricted.
  Resource Allocation: If resources (machines, labor) are allocated to specific operations, changing the sequence may violate the resource allocation rules.
  
  Solution:
  
  Review Operation Sequence: Check the operation sequence in the production order and ensure that any changes you are trying to make do not violate the defined sequence.
  Check Dependencies: Look for any dependencies between operations that may prevent the exchange of sequences. You may need to adjust the routing or dependencies if necessary.
  Change Order Status: If the production order is in a status that does not allow changes (e.g., released, in process), you may need to change the status back to a state that allows modifications (e.g., "Created" or "Planned").
  Consult Routing: Review the routing for the production order to ensure that it allows for the desired changes. If necessary, modify the routing to accommodate the changes.
  Use Transaction Codes: Utilize transaction codes like CO02 (Change Production Order) to make the necessary adjustments, ensuring that you are following the correct sequence.
  
  Related Information:
  
  SAP Documentation: Refer to SAP Help documentation for detailed information on production order processing and routing.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CO01 (Create Production Order), CO02 (Change Production Order), and CO03 (Display Production Order).
  User Exits and BAdIs: If you have custom logic implemented, check for any user exits or BAdIs that might be affecting the operation sequence.
  SAP Notes: Search for SAP Notes related to error CO591 for any known issues or patches that may address the problem.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in production planning and control.