When a one-step Sales Order invoice is created, the Item Inquiry On SO and Committed quantities are increased by the quantity on the invoice. The In Shipping field in Item Inquiry is also populated with the quantity. There is not a Sales Order that is referenced on the Orders tab.
If the Orders tab total does not match the On SO amount on the Main tab, check the In Shipping column to see if there are one-step invoices (with no Sales Order) that are not updated.
Or, if job cost is used....
Enter a Cost Code and Cost Type on the lines tab for the item in question.
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