How To Fix /SAPAPO/OM_ERROR378 - Constraint cannot be scheduled simult. between predecessor and successor

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/OM_ERROR -

• Message number: 378

• Message text: Constraint cannot be scheduled simult. between predecessor and successor

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/OM_ERROR378 - Constraint cannot be scheduled simult. between predecessor and successor ?

  The SAP error message /SAPAPO/OM_ERROR378 indicates that there is a scheduling conflict between a predecessor and a successor in the context of Advanced Planning and Optimization (APO) in SAP. This error typically arises when the constraints defined for the production process do not allow the predecessor and successor operations to be scheduled simultaneously.
  Cause:
  
  
  Constraint Violations: The error usually occurs due to constraints set in the production process, such as:
  
  Time constraints that prevent the successor from starting before the predecessor has finished.
  Resource constraints that do not allow both operations to be executed at the same time.
  Capacity limitations on the resources involved in the operations.
  
  
  
  Incorrect Setup: The configuration of the production process, including the definitions of the operations, their relationships, and the resources assigned, may not be set up correctly.
  
  
  Scheduling Parameters: The scheduling parameters defined in the APO system may not align with the operational requirements, leading to conflicts.
  
  
  Solution:
  
  
  Review Operation Relationships: Check the relationship between the predecessor and successor operations. Ensure that the successor is set to start only after the predecessor has completed.
  
  
  Adjust Constraints: Modify the constraints associated with the operations. This may involve:
  
  Changing the timing constraints to allow for proper scheduling.
  Ensuring that the resources assigned to both operations can handle the load without conflict.
  
  
  
  Check Resource Availability: Verify that the resources required for both operations are available and not over-allocated. If necessary, adjust the resource assignments or capacity.
  
  
  Re-evaluate Scheduling Parameters: Review the scheduling parameters in the APO system to ensure they are appropriate for the production process. Adjust them if needed.
  
  
  Use Alternative Scheduling Techniques: If the issue persists, consider using different scheduling techniques or methods that may better accommodate the constraints of your operations.
  
  
  Related Information:
  
  Transaction Codes: You may want to use transaction codes like /SAPAPO/SDP94 (for planning board) or /SAPAPO/OM_ORDER (for order management) to analyze the scheduling and constraints.
  Documentation: Refer to SAP documentation for detailed information on setting up operations, constraints, and scheduling in APO.
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to this error message or provide updates and patches.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution to resolve it.