did you create the matching USER devtest in the database where the procedure was created?
did you grant execute to the user devtest ont eh procedure?
CREATE USER devtest FOR LOGIN=devtest
GRANT EXECUTE ON myProcedure TO devtest
if you login and don't have a user mapped, the logincannot execute a stored proceudre...only users can.
a login does not have any rights to objects within a database. (unless it's int he sysadmin role...that shortcuts/trumps user permissions)
Lowell