once i had a problem with slow lookup of Item Ledger Entries.
After some analysis it became clear that the flow fields based on "Value Entry" table data were to be blamed.
so in the form 38 "Item Ledger Entries" i check for lookup mode and if it is lookup mode i make flow fields invisible.
Another alternative would be to pass temporary table (pre-filled with required records from a real one) to the lookup form
Why you does'nt run your own form :?: when you need the lookup mode
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