Markup Code by Part Class - when using Profit - Ridiculous output

Ok - so this is likely an issue with Epicor but just in case someone has a solution.

My client is using Markup Codes by Part Class - however they are calculating using Profit not Markup. NOTE: THIS DOES NOT HAPPEN WHEN USING MARKUP

We added a Markup code with the predefined Markup Codes
Start the Quote
Do the normal stuff
We decide to change one of the markup/profit % in the Markup Tab to ANYTHING but what was there.
Go back to Worksheet and Refresh Worksheet. Suddenly the calculation % for material goes from a normal calculated percent to 99.99%!!! Doesn’t matter what we do after that it always does this.

Has anything seen this? I’ve never seen this before 10.2.600 (then again that is a pretty long list of "never seen before 10.2.600).

TIA,

John

UPDATE: Turns out that the client had 100% for the markup % on one of the part classes. This resulted in the “division by zero” error but it doesn’t actually show you. I found it as I know the formula for Profit (cost/(1-%)).