Incorrect quantity shown for Quantity on Order in Product Record

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Hi 

We are facing problems with Sage showing incorrect quantities on "On Order" under product record. The image below shows that this item is on two orders for a quantity of 150 and 30 pieces respectively. Whereas "On Order Quantity" is showing 330 pieces.  How can this be checked that where are the remaining 150 pieces?

Regards,

Amit