This document explains MYOB Purchase order error.

Detail Steps

Changing MYOB Purchases affects inventory value and QTY, changing the purchase QTY will try to add/remove value and QTY from the stock list, if you are removing all stock by your transactions and if your value on the purchase line does not match exactly the value you have in stock you will come across this error.

MYOB will not let the line be deleted or changed if it will leave you with either negative quantity on hand or a positive or negative value of stock.

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