Table control in module pool
I am doing my module pool programing. I am creating 3 screens. In the first screen i am displaying customer no. If i click the customer number it wil display second screen with sales order. If i click sales order header it will display sales order item details.
I create all the screens and table controls in the module pool. My question is how to write the logic and wher exactly(PBO or PAI) write the code.