Hello,
We have not made any changes to Purchase Orders for Adagio that would have changed the way your taxes were being handled. Your previous post said that this had been going on for more than a year.
To reduce the cost of the inventory items, you'll need to enter an inventory adjustment transaction to the cost amount only (you can adjust both costs and quantities in an adjustment transaction.
Problems with tax calculations are really difficult to troubleshoot over the forum, as they are completely dependent on the specific setup of your tax tables, inventory items and vendor coding, as well as the way that transactions are being entered into the system. Your Adagio consultant, or someone experienced in the use of GridView should be able to help you determine what the GST amounts calculated were.
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Andrew Bates