How To Call Proc On Linked Oracle Server

Sorry if this is very stupid question, but i've spent too long searching for the answer:

I have a linked Oracle server set up for RPC in SQL server 9 db. How do I call it? I've tried this, but gives Unspecified error:

"

OLE DB provider "OraOLEDB.Oracle" for linked server "SANSORA1" returned message "Unspecified error".

"

From this:



declare @UserName char(20) -- Current Username

declare @Password varchar(20) -- Current Password

declare @PasswordNew varchar(20) -- New Password

declare @PasswordCfm varchar(20) -- Confirm New Password

set @UserName = '900878'

set @Password = '900878'

set @PasswordNew = '777'

set @PasswordCfm = '777'

declare @return int

exec SANSORA1..PCG.USR_CHANGEPASSWORD @UserName ,@Password ,@PasswordNew ,@PasswordCfm;

--Exec ( 'SANSORA1..PCG.USR_CHANGEPASSWORD (' + @UserName + ' ,' + @Password + ' ,' + @PasswordNew + ' ,' + @PasswordCfm + ')')