How To Fix /PLMI/MBOM_MAP_29123 - Subitem number has already been assigned

SAP Error Message - Details

• Message type: E = Error

• Message class: /PLMI/MBOM_MAP_29 -

• Message number: 123

• Message text: Subitem number has already been assigned

Self-Explanatory Message

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To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /PLMI/MBOM_MAP_29123 - Subitem number has already been assigned ?

  The SAP error message /PLMI/MBOM_MAP_29123 indicates that there is an issue with the assignment of subitem numbers in the context of a Manufacturing Bill of Materials (MBOM). This error typically occurs when you are trying to assign a subitem number that has already been used for another component or item in the same context.
  Cause:
  
  Duplicate Subitem Assignment: The most common cause of this error is that the subitem number you are trying to assign is already in use for another component in the same MBOM or related structure.
  Data Entry Error: It may also occur due to a manual data entry error where the same subitem number is mistakenly entered for multiple components.
  System Configuration: There could be issues related to system configuration or settings that prevent the assignment of subitem numbers correctly.
  
  Solution:
  
  Check Existing Assignments: Review the existing MBOM to see which components are already using the subitem number you are trying to assign. You can do this by navigating to the relevant MBOM in SAP and checking the subitem assignments.
  Use a Unique Subitem Number: If the subitem number is already in use, you will need to select a different, unique subitem number for the component you are trying to add or modify.
  Correct Data Entry: If the error is due to a data entry mistake, correct the entry to ensure that each component has a unique subitem number.
  Consult Documentation: Refer to SAP documentation or help resources for guidance on how to manage MBOMs and subitem assignments effectively.
  System Configuration Review: If you suspect a configuration issue, consult with your SAP Basis or technical team to review the system settings related to MBOMs and subitem management.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CS01 (Create BOM), CS02 (Change BOM), and CS03 (Display BOM) to manage your BOMs effectively.
  SAP Notes: Check for any SAP Notes related to this error message or MBOM management that may provide additional insights or patches.
  User Roles and Permissions: Ensure that you have the necessary permissions to make changes to the MBOM, as restrictions may also lead to errors.
  
  If the problem persists after trying the above solutions, it may be beneficial to reach out to your SAP support team for further assistance.