How To Fix WS520 - FI document creation not possible for different material periods

WS520 - Overview

• Message type: E = Error

• Message class: WS - Supplier Billing Document

• Message number: 520

• Message text: FI document creation not possible for different material periods

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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WS520 - Details

• SAP Error Message:
  WS520 - FI document creation not possible for different material periods
  
  
  Cause:
  This error occurs when you try to post a material document in Inventory Management (MM) for a period that is different from the period open in Financial Accounting (FI). In other words, the posting period for the material document (MM) and the FI document do not match or overlap, causing a conflict.
  Typically, this happens because:
  
  The material document is being posted in a period that is closed or not open in FI.
  The FI posting period is different from the MM posting period.
  The system settings require that material and FI postings must be done in the same period or compatible periods.
  
  
  Explanation:
  In SAP, Inventory Management (MM) and Financial Accounting (FI) have their own posting periods. For consistency and reconciliation, SAP requires that postings related to material movements and their corresponding FI documents occur in the same or compatible posting periods.
  If the