[A] In order to check balance quantity, go to report module and find purchase order(Item-wise) report

[B] Use the various filter to get custom data and click on "Generate Report".

[C] After the report is generated, search for "Quantity" in column search option and select the Quantity, Delivered Quantity and Balance Quantity

[D] Now scroll to the right side where you can see these three columns added in the report, from which you can see the order quantity, delivered quantity and balance quantity of the purchase order(PO).
 

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