How To Fix X4521 - An error occurred for suboperation &1/&2 of the standard sequence

X4521 - Overview

• Message type: E = Error

• Message class: X4 - APO Core Interface: Interfaces for Manufacturing Orders

• Message number: 521

• Message text: An error occurred for suboperation &1/&2 of the standard sequence

What causes this issue?

An error occurred during the processing of the suboperation &V2& for
operation &V1& of the standard sequence.

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?

See the subsequent message in the application log to determine the
cause of error.
Then, rectify the cause of the error.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

X4521 - Details

• The SAP error message X4521 indicates that there was an issue during the execution of a suboperation within a standard sequence. This error typically arises in the context of production planning, order processing, or similar operations where sequences of tasks or operations are defined.
  
  Cause:
  The error can be caused by several factors, including but not limited to:
  
  
  Configuration Issues: Incorrect configuration of the standard sequence or suboperations in the system.
  Missing Master Data: Required master data (like materials, work centers, or routing) may be missing or incorrectly set up.
  Dependencies: There may be dependencies between operations that are not being met, such as prerequisites for a suboperation that have not been fulfilled.
  System Errors: Technical issues or bugs in the SAP system that prevent the proper execution of the sequence.
  Authorization Issues: The user executing the operation may not have the necessary authorizations to perform the suboperation.
  
  
  Solution:
  To resolve the X4521 error, you can take the following