How To Fix 3B105 - The main pers.no. must not be changed for an already posted period

3B105 - Overview

• Message type: E = Error

• Message class: 3B - Messages HR SK

• Message number: 105

• Message text: The main pers.no. must not be changed for an already posted period

Self-Explanatory Message

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3B105 - Details

• The SAP error message 3B105 ("The main pers.no. must not be changed for an already posted period") typically occurs in the context of personnel administration when there is an attempt to change the main personnel number (main pers.no.) for an employee in a period that has already been posted. This is a safeguard in SAP to maintain data integrity and ensure that historical records remain consistent.
  
  Cause:
  
  Change Attempt: The error is triggered when a user tries to change the main personnel number of an employee for a period that has already been processed and posted in the system.
  Data Integrity: SAP enforces this rule to prevent inconsistencies in payroll and other HR-related data that rely on the main personnel number.
  
  
  Solution:
  
  Check Posting Period: Verify if the period you are trying to change is indeed already posted. If it is, you will not be able to change the main personnel number for that period.
  Use