unable to register sapccm4x agent
trying to register the SAPCCM4x agent in my landscape, after giving the password for CSMREG user i am getting the error "104 RFC_ERROR_SYSTEM_FAILURE' [you cannot log on CUA system assignment missing]
error in sapcm4x log is as below. Could some help me on this. I went through SAP NOTE 987166 but no luck.
ERROR file opened at 20090422 114840 Central Daylight Time, SAP-REL 700,0,144 RFC-VER 3 957098 MT-SL
T:2656 Error in program 'sapccm4x': ======> You cannot log on (CUA system assignment missing)
T:2656 Error in program 'sapccm4x': <* RfcReceive  : returns 3:RFC_SYS_EXCEPTION