IDOC issue while creating source system in SCM 5.10

I faced this issue while creating a source system in SCM5.10 .

Solution :
           1 )  Goto tcode WE30:
            2  The IDOC type ZSNA022 does not exist in the system .
                 so , create it as a copy of type RSSEND.
           3) Afterwards, Check the following:
                 i) goto view EDIMSG (tcode SM30): see if  Message type RSSEND is linked to the IdocType   as specified above.

                ii) Also make sure your entries are in  RSBASIDOC table .