stored proc via ODBC cannot get value

[mouniryoussef]

RDBMS: Sql server 2000 (ODBC drive)
PB 8.0.3

i try to run an stored proc that have 2 arguments :
string ls_user, ls_approval
ls_approval = Fill(" ", 1)
SQLCA.sp_acq_ca_aprroval(ls_user,ref ls_approval )

under MSS sql server driver (6.5) i get the ls_approval
value but using ODBC driver i get always " " ?

any idea ?

thanks for your help
Mounir