How To Fix 3G400 - Account assignment object replaced by substitute cost center

3G400 - Overview

• Message type: E = Error

• Message class: 3G - Payroll: International

• Message number: 400

• Message text: Account assignment object replaced by substitute cost center

What causes this issue?

The account assignment object check showed that this object is not
valid in Cost Accounting and cannot be posted. The employee's master
cost center can also not be used because it is either also invalid, or
has a company code different to the company code for the specified
account assignment object. For this reason, it has been posted to the
substitute cost center for the company code to which the specified
account assignment object belongs. This cost center is stored in
Customizing.

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?

Error message extract from SAP system. Copyright SAP SE.

3G400 - Details

• The SAP error message "3G400 Account assignment object replaced by substitute cost center" typically occurs in the context of financial postings, particularly when dealing with cost centers in SAP. This message indicates that the system has automatically replaced the original account assignment object (such as a cost center) with a substitute cost center during the posting process. This can happen for several reasons, and understanding the cause and potential solutions is essential for resolving the issue.
  
  Cause:
  
  Cost Center Assignment Issues: The original cost center may not be valid for the specific posting or may not exist in the system.
  Cost Center Status: The original cost center might be inactive or closed for the period in which the posting is being made.
  Substitution Rules: There may be substitution rules defined in the system that automatically replace certain cost centers with substitutes based on specific criteria.
  Master Data Issues: There could be issues with the master