Make Lookup Field by using OnAssistEdit Trigger:
(1) In this blog, we get to know about the “OnAssistEdit” trigger of the field on a page. By using this feature, try to make a lookup field.
(3) After creating the extension, now open the page extension and add the “OnAssistEdit” trigger and write code, as shown.
(4) After doing the above step, publish the extension and open the Sales Order and see the Barcode Scanning field with the Assist button feature, as shown.
(5) After pressing the button, a new entry page is open as shown.