Hi,
using Master Multi Detail example I created grid form with 3 tables. I want to select more then one value from master table and pass ids to second and third grid form – but get only the last one selected.

Example code: https://pastebin.com/4QUfgbsE

In short, i want to use:
"SELECT id,client_id,invdate,amount,tax,total FROM invheader WHERE client_id IN ( $id )"

Not:
"SELECT id,client_id,invdate,amount,tax,total FROM invheader WHERE client_id = $id "