Information that you want to look up and pass through to your current activity / transaction is only possible if you develop the same screen for every transaction.
Example:
If you would like to look up stock information in a purchase order line and have a selection inserted in you current purchase order line you have to develop a screen for purchase.
If you want to have the same functionality for a sales order line means you have to develop the same screen with stock info again!
It should be possible to develop one screen / form from which values are passed to the screen from which you invoked this (now general) form.
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