Service Tax registration

i'm trying to register for Service tax online through ACES but in it, in the list of services, there is no service code like, 'Manpower Recruitement or supply agency', only 'Manpower recruitement' code is available.

Are they both same. I basically supply my employees to a Govt. Organisation  and charge them monthly.
 Do this come under Manpower Recruitement only or 'Business Auxillary Service'. Please clarify and tell me what happens if we pay service tax with a wrong code.

Thanks in advance