How To Fix CY421 - The capacity requirements are already split

SAP Error Message - Details

• Message type: E = Error

• Message class: CY - Capacity Requirements Planning

• Message number: 421

• Message text: The capacity requirements are already split

What causes this issue?

You are trying to allocate a capacity requirement directly to an
individual capacity. With this capacity requirement you are not dealing
with a split; however, the requirement has already been split.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

You can only allocate a capacity requirement directly to an individual
capacity or person if it has not yet been split.

System Response

The allocation is terminated.

How to fix this error?

If you want to split or allocate a capacity requirement you can do this
on the dialog box "Split/allocate".

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CY421 - The capacity requirements are already split ?

  The SAP error message CY421 ("The capacity requirements are already split") typically occurs in the context of capacity planning and production scheduling within SAP's Production Planning (PP) module. This error indicates that the system has detected that the capacity requirements for a particular operation or resource have already been split, and it cannot be split again.
  Cause:
  
  
  Capacity Splitting: The error arises when there is an attempt to split capacity requirements that have already been split. This can happen if:
  
  You are trying to re-schedule or re-plan an operation that has already been split into multiple segments.
  There are conflicting settings or configurations in the production order or routing that prevent further splitting.
  
  
  
  Resource Configuration: The configuration of the resources or work centers may not allow for further splitting due to specific settings in the capacity planning parameters.
  
  
  Order Status: The status of the production order may also play a role. If the order is in a status that does not allow for changes, this error may occur.
  
  
  Solution:
  
  
  Check Capacity Requirements: Review the capacity requirements for the operation in question. Ensure that you are not attempting to split an already split requirement.
  
  
  Review Production Order: Check the production order and its status. If the order is already released or in a status that does not allow changes, you may need to adjust the order status or create a new order.
  
  
  Adjust Settings: If the splitting is necessary, review the configuration settings for the work center or resource. You may need to adjust the parameters that control capacity splitting.
  
  
  Use Alternative Methods: If splitting is not possible, consider using alternative methods for scheduling or capacity planning, such as adjusting the production order quantities or changing the scheduling parameters.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on capacity planning and splitting requirements.
  
  
  Contact SAP Support: If the issue persists and you cannot find a resolution, consider reaching out to SAP support for assistance. They can provide insights based on your specific system configuration and version.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CO02 (Change Production Order), CO03 (Display Production Order), and CM01 (Capacity Planning) to analyze and manage production orders and capacity.
  Capacity Planning: Understanding the principles of capacity planning in SAP can help in troubleshooting and resolving issues related to capacity requirements.
  SAP Notes: Check for any SAP Notes related to error CY421, as there may be patches or updates that address known issues.
  
  By following these steps, you should be able to diagnose and resolve the CY421 error in your SAP system.