This error in calculation is happening on parts already in inventory. When we reorder and edit cost (if different from previous ordering). When you save the changes, a window will pop up and ask "if you would like to update the cost". The calculation error happens when you answer "yes"

No, these items were not already in inventory, they were new parts

I have found that the program has a major error in the calculation process for inventory parts. Has anyone else had this issue

I am having problems with our program. when we create a non-inventory part to an order then change to an invoice. The program is creating the part into inventory as a negative quantity inventory entry. We have "NOT" checked the "Box" to create an inventory item.