C2138 - Order &: Subnetwork scheduled backwards

SAP Error Message - Details

• Message type: E = Error

• Message class: C2 - Other messages production orders

• Message number: 138

• Message text: Order &: Subnetwork scheduled backwards

What causes this issue?

Teilnetze im Auftragsnetz werden mit RnckwSrtsterminierung terminiert.
Dies geschieht unabhSngig von der aktuellen Terminierungsart.

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.

AnswerBot

• What is the cause and solution for SAP error message C2138 - Order &: Subnetwork scheduled backwards ?

  The SAP error message C2138, which states "Order &: Subnetwork scheduled backwards," typically occurs in the context of production planning and scheduling within SAP. This error indicates that there is a scheduling conflict where the planned start time of a subnetwork (or operation) is set to occur before its predecessor operation has been completed. This can lead to inconsistencies in the production process, as operations cannot logically start before their prerequisites are finished.
  Causes:
  
  Incorrect Scheduling Parameters: The scheduling parameters for the operations or networks may not be set correctly, leading to backward scheduling.
  Dependencies Not Defined: There may be missing or incorrectly defined dependencies between operations in the network.
  Resource Constraints: Resource availability might not be properly accounted for, causing the system to attempt to schedule operations in an illogical order.
  Manual Changes: Manual adjustments to the scheduling of operations may have inadvertently created a situation where operations are scheduled out of order.
  
  Solutions:
  
  Check Operation Dependencies: Review the dependencies between operations in the network. Ensure that all predecessor and successor relationships are correctly defined.
  Adjust Scheduling Parameters: Verify and adjust the scheduling parameters for the operations. This includes lead times, setup times, and any other relevant parameters that could affect scheduling.
  Re-schedule the Order: Use the scheduling functions in SAP to re-schedule the order. This may involve using transaction codes like CO02 (Change Production Order) or CM21 (Capacity Planning) to adjust the scheduling.
  Review Resource Availability: Ensure that the resources required for the operations are available and that their availability is correctly reflected in the system.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on scheduling issues related to your version of SAP.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CO01 (Create Production Order), CO02 (Change Production Order), and CM21 (Capacity Planning) for managing production orders and scheduling.
  SAP Notes: Check SAP Notes for any known issues or patches related to scheduling errors. SAP Notes can provide additional insights or solutions for specific versions of SAP.
  Training and Support: If the issue persists, consider reaching out to your SAP support team or consulting with an SAP expert who specializes in production planning and scheduling.
  
  By addressing the underlying causes and following the suggested solutions, you should be able to resolve the C2138 error and ensure that your production scheduling is logical and efficient.