Hi,

i've created a custom filed called "percentage" on module Customers and a custom module "CustomeModule1" with a lookup field to module Customers. On this custom module there is a data entry field "value1"  and another field called "value2" which should to be the percentage of field "value1" where the percentage number is coming from the lookup field on customers module. 

Where and how do i make the calculation, on the UI or during record submit ? Can you provide an example ?

Thank you