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

CO591 - Overview

• 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.

CO591 - Details

• 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: