Forms :: PL/SQL Collections In Datablock

I have one plsql table which is having 10,000 rows, i want to populate this values in a forms datablock, i have used the below query in pre-query of that block

declare
plsql_rec pkg.plsql_tab;
begin
plsql_rec := pkg.func;
set_block_property('blk_name', query_data_source_name, 'select e.ename, e.empno from table(plsql_rec) e');
end;

in the property of the block i set like below

Database Data Block = YES
Query Allowed = YES
Query Data Source Type = FROM clause query
Query Data Source Name = SELECT 1, 2 FROM DUAL

but while executing it says invalid identifier "plsql_rec",