How To Fix /SAPAPO/PUIA_MESS301 - Quantity change for STO in line &1 is not allowed.

/SAPAPO/PUIA_MESS301 - Overview

• Message type: E = Error

• Message class: /SAPAPO/PUIA_MESS -

• Message number: 301

• Message text: Quantity change for STO in line &1 is not allowed.

Self-Explanatory Message

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/SAPAPO/PUIA_MESS301 - Details

• The SAP error message /SAPAPO/PUIA_MESS301 indicates that a quantity change for a Stock Transport Order (STO) in line &1 is not allowed. This error typically occurs in the context of Advanced Planning and Optimization (APO) when trying to modify the quantity of a stock transport order that is not permitted due to various reasons.
  Causes:
  
  Locked or In-Use Orders: The STO may be locked or currently in use by another process, preventing changes.
  Status of the STO: The status of the STO may not allow for changes. For example, if the order is already confirmed or has been partially delivered, changes may be restricted.
  Configuration Settings: There may be configuration settings in the system that restrict changes to certain types of orders or under specific conditions.
  Business Rules: There may be business rules in place that prevent changes to quantities once certain conditions are met (e.g., delivery dates, shipment status).
  APO vs. ECC Discrepancies: If there