ProcessMaker Forum | BPM Workflow Simplified

HELLO
I have a Drop Down list
with this query
select ID,GN
FROM
PMT_GINDEX
the first filed is empty, second one is KPI and the third one is FPI
now the default value is empty

I want when i open the form the KPI showed as default value
I tried to wrote the KPI in the default value but it didn't work!
I tried this Triger but it didn't work too

if (empty(@@group)) {
@@group = "KPI";
}

please help me

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