EP - SCM

Can we integrate EP7.0 with SCM 5.0 In portal system adminstartion I can see only SAP_R3,SAP_CRM,SAP_BW. I can not see other compoenets like SAP_SCM , etc.. since there is no system like SAP_SCM is it possible to use the SAP_R3 to connect the SCM box ???

please let me know ???