How To Fix GA780 - Document &/& already exists (line items not posted)

GA780 - Overview

• Message type: E = Error

• Message class: GA - Allocations

• Message number: 780

• Message text: Document &/& already exists (line items not posted)

What causes this issue?

A CO-PA line item already exists with this document/item number.
The number range for transaction type "D" has probably been modified.

System Response

Cost center assessment to Profitability Analysis is terminated.

How to fix this error?

Contact your system administrator. The number range must be set for
document numbers that are not yet in use. You can then rerun the cycle.

Error message extract from SAP system. Copyright SAP SE.

GA780 - Details

• The SAP error message GA780 ("Document &/& already exists (line items not posted)") typically occurs when you attempt to post a document that has already been created in the system, but the line items associated with that document have not been fully processed or posted. This can happen in various SAP modules, particularly in Financial Accounting (FI) or Controlling (CO).
  Causes:
  
  Duplicate Document Number: The document number you are trying to post already exists in the system, and SAP does not allow duplicate postings for the same document number.
  Incomplete Posting: The document may have been created but not fully posted, leaving it in a state where it cannot accept new line items.
  Document Type Restrictions: Certain document types may have restrictions that prevent multiple postings or require specific conditions to be met before they can be posted again.
  User Error: The user may have inadvertently tried to post the same document multiple times.
  
  Solutions:
  
  Check Existing