Hello, 

Can you help me with one issue? 

I've created custom module "Payment plan" with field "Number" and lookup fields ('Accounts" and "Invoices"), and added this module as a related list to these default modules. 

So I can add items from "Payment plan" within Invoice card. But when I open modal window to add items, I can't search in any fields except "Number", but more convenient would be to search in other fields, for example in Account or invoice.

Can I do this in any way?

Screen capture to illustrate: