Has anyone already created a form in a Modal window for editing the relation (for ex. Prod & Oppo)?
If so could you explain how you did this ?
Create the form in Designer for the relation table (cf standard form: Standard: Edit Relation Opportunity-Company for instance)
Override the macro RelationSectionsForm in MacroRelation.txt don't forget to specify the entity and the detail for instance : RelationSectionsForm.Comp.Oppo and RelationSectionsForm.Oppo.Comp. In this macro you should write the ID of the form you have created