Printing docs using control parameters

Hello,

I had a problem in printing multiple document in one spool request and the issue was solved, Now in the select option if i give "From"  "To" numbers( Eg 50000002 to 50000005)  the printing is done and if i give only one document number the print does not trigger.

Please find the code

w_cnt2 = sy-tabix.
  case w_cnt2.
when 1.
control_parameters-no_open   = space .
control_parameters-no_close  = 'X' .
when w_cnt .
control_parameters-no_open   = 'X' .
control_parameters-no_close  = space .
when others.
control_parameters-no_open   = 'X' .
control_parameters-no_close  = 'X' .
endcase.

Kindly help.

Regards,

Sam.