when using FND_FLEX_FIND.QUERY_KFLEX_RANGE in pre-query it gives error unable to perform query

hi am using FND_FLEX_FIND.QUERY_KFLEX_RANGE in custom form to open the range of KFF

as in document followed the steps

in the query Find

SYNCHRONIZE;

fnd_flex_find.find_kflex_range('SQLGL', 'GL#',

v_num,

'acc_num',

other_tokens=>'TITLE="' || 'Chart of Accounts' || '"');

and in

FND_FLEX_FIND.QUERY_KFLEX_RANGE('SQLGL', 'GL#', v_num,

:PARAMETER.acc_num_low,

:PARAMETER.acc_num_high,

'budgetDetail.Acc_num')

so when query it gives error unable to perform query and the query end in acc_id in (select code_combination_id)

so is there something missing or it can't be used in custom forms?