How To Fix CP290 - You cannot change the unit in referenced operation sets

SAP Error Message - Details

• Message type: E = Error

• Message class: CP - Task list messages: Core data

• Message number: 290

• Message text: You cannot change the unit in referenced operation sets

What causes this issue?

You are attempting to change the header unit for an operation set which
can be referenced. However, this is not allowed because the units of
the operation set being referred to and the units of the referenced
operation set must be the same.
The units must be the same because the standard values of the
operations are related to an operation unit of measure and a conversion
factor which show the relationship between operation unit of measure
and header unit.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CP290 - You cannot change the unit in referenced operation sets ?

  The SAP error message CP290, which states "You cannot change the unit in referenced operation sets," typically occurs in the context of production planning and control when you attempt to change the unit of measure for an operation that is part of a referenced operation set in a routing or production order.
  Cause:
  
  Referenced Operation Sets: The operation you are trying to modify is part of a referenced operation set. These sets are often used to maintain consistency across multiple production orders or routings.
  Unit of Measure Restrictions: SAP enforces certain restrictions on changing units of measure for operations that are linked to other operations or production orders to prevent inconsistencies in planning and execution.
  Data Integrity: The system is designed to maintain data integrity and ensure that all related operations and orders remain consistent.
  
  Solution:
  
  Check Operation Set: Review the operation set to determine if it is indeed referenced by other operations or production orders. If it is, you may need to change the unit of measure in those references first.
  Create a New Operation: If changing the unit of measure is necessary, consider creating a new operation with the desired unit of measure instead of modifying the existing one.
  Adjust Routing: If applicable, you may need to adjust the routing or production order to remove the reference to the operation set before making changes.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines on handling operation sets and units of measure.
  Contact Support: If you are unable to resolve the issue, consider reaching out to your SAP support team or consulting with an SAP expert for assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CA01 (Create Routing), CA02 (Change Routing), and CO02 (Change Production Order) to navigate the system effectively.
  SAP Notes: Check for any SAP Notes related to this error message for additional insights or patches that may address the issue.
  Training and Documentation: Ensure that users involved in production planning are trained on the implications of changing units of measure and the structure of operation sets in SAP.
  
  By following these steps, you should be able to address the CP290 error and understand the underlying reasons for its occurrence.