Hmm... you like to complicate things for yourself, do you?
Why don't you try to get it to run in the SQL console first?
Anyhow, there's just a little typo:
Can you please help find what is wrong in this below script? I am not good at script hence struggling..
var_out= select "t1.BILL_VBELN",...
should be
var_out= select t1."BILL_VBELN",...
------^--^
instead.
The double quotation marks contain only the table_name or only the column_name.
It's always just one "identifier".
The dot (.) goes in between, always without quotation marks.
- Lars