How To Fix WSTRN122 - You cannot change delvry phases, follow-on docs f. alloc. table it. exist

WSTRN122 - Overview

• Message type: E = Error

• Message class: WSTRN - Message for Prepack Creation and Planning Dialog

• Message number: 122

• Message text: You cannot change delvry phases, follow-on docs f. alloc. table it. exist

Self-Explanatory Message

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• What is the cause and solution for SAP error message WSTRN122 - You cannot change delvry phases, follow-on docs f. alloc. table it. exist ?

  SAP Error Message:
  WSTRN122 – "You cannot change delivery phases, follow-on docs f. alloc. table it. exist"
  
  
  Cause:
  This error occurs when you attempt to change the delivery phases or follow-on documents in a sales document or delivery, but there are already allocation table entries (e.g., schedule lines, delivery items, or follow-on documents) linked to the document. Essentially, the system prevents changes to delivery phases or follow-on documents because these changes would conflict with existing allocations or references.
  In other words, the system enforces data consistency by not allowing modifications that would invalidate or contradict existing delivery or allocation data.
  
  Explanation in Context:
  
  Delivery phases refer to the planned partial deliveries or schedule lines in a sales order.
  Follow-on documents are documents created from the sales order, such as deliveries, billing documents, or reservations.
  The allocation table keeps track of the relationship between sales order items, schedule lines, and follow-on documents.
  
  If follow-on documents or allocations exist, changing delivery