I am trying to create a lookup filter from a custom object (FormProduct) to Product on the FormProduct object lookup field and set the criteria on a field on the FormProduct (ProductType__c) but this field is not available.
I have checked that it is visible and available to everyone and is on the layout.
What have I missed here. I believe I have followed the documented way to create a filter and cannot see any difference in the other fields on the FormProduct object that are available to be selected.
Any and all help greatly appreciated