Trigger to execute query when value from LOV is selected

HI Guys,
I have a form in which I have 2 fields in Master and 4 fields in detail, all showing on the same canvas.
I have put an 'execute_query' in when_new_form_instance trigger so that when I open the form it is pre - populated.
The Master fields draw values from LOVs. I want to execute the master block query when the user selects a value from LOV, so in which trigger should I put it.
I have tried in 'when_validate_item' and 'when_list_changed' triggers but it is showing an error.
So, what should I do?
Regards
Ranjan

I have designed a form in which there are two items in header level and two in line level. I have defined master - child relationship between the two blocks.
I have put a execute_query for header in when_new_form_instance trigger so that when user opens the form, all fields are initially populated.
Each Field has an LOV attached to it.
Form Outline :
Header : Ledger Name
Ledger_approver
Line : Approver
Amount
Initially all details for Ledger L1 is populated.
If the user now selects Ledger L2 from LOV, then when he moves out of that item, immediately all details about L2 should get populated in the fields.
I Have tried execute_query in when_validate_item of Ledger Name but I get error that we cannot use restricted procedure in when_validate_item trigger.
I hope this explains my issue.
Regards,
Ranjan

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