Purchase Order IV qty is more than GR qty since we set IV based on GR

[SusanFu]

In production system, we found an purchase order met a problem that rarely happened: PO qty is 30 KG, GR qty is 30 KG, IV qty is 40 KG.(1st IV-30KG, 2nd IV-10KG). 

This purchase order item wasn't be changed. 

and we found Purchasing info record is created before purchase order and click the Purchasing control option"Goods-Receipt-Based Invoice Verification "already.

Pls help to found the reason why it be happened and how to prevent such problem in future.

[OwenLiu]

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