How To Fix GPSC056 - Period already posted - Volume or Master data may have changed since

GPSC056 - Overview

• Message type: E = Error

• Message class: GPSC - PSC Application

• Message number: 056

• Message text: Period already posted - Volume or Master data may have changed since

What causes this issue?

This Period is already posted. The Print functionality recalculates all
values. Master Data (Rules, Schemas, Assignments) may have changed
since posting and could lead to different results.
Volumes and Product Assignments are locked against changes when used
in PSC postings, but Calculation Schemes and Rollup Rules may have
changed.

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?

Please compare with stored PSC document (Report Document display by
Period)

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

GPSC056 - Details

• The SAP error message GPSC056 ("Period already posted - Volume or Master data may have changed since") typically occurs in the context of SAP's Global Trade Services (GTS) or similar modules where data integrity is crucial for financial and operational reporting. This error indicates that an attempt is being made to post or modify data in a period that has already been closed or finalized, which can lead to inconsistencies in reporting and data integrity.
  Causes:
  
  Closed Posting Period: The most common cause is that the posting period for the transaction has already been closed. This means that no further changes can be made to the data for that period.
  Master Data Changes: Changes to master data (like customer, vendor, or material master records) that affect the transaction may have occurred after the period was closed.
  Volume Data Changes: Similar to master data, if volume data (like sales orders, deliveries, etc.) has been modified