hi all thanks for answer....
I think Tiki Patra has reason:
>>>>>And you can not use field symbol <fst_bsis_line> directly in the select statement. Instead put it in an internal table and then assign the contents to the FS.
because isn't a problem of Clear the table (I think), understand too CLEAR <fst_bsis_line>. isn't incorrect. is better: UNASSIGN <fst_bsis_line>. I am right?
the second problem is
>>>>> 2) missing of CORRESPONDING FIELDS in select statement.
ok, I typed the code same as: Tiki Patra (to adapted the advice of Abdul Raheem Mohammad)recommended.
thanks for your comments.
I testing the code.