When RFC uses, Can I use common user

Hello,
I plan to use RFC that is link between R/3 to external System.
The system I'm thinking is that R/3 is the data storage target, external System is the Data Input.
So, I use RFC to call function Call from external System.
Now,The things I don't know is,
When I use Common User for calling RFC, All I need is one Common User license, Is that possible?
The external System is used by a lot of users.
Should I pay a lot more license fee than one common user.
Thanks.
Regards
Koji

Hi koji,
1. The user in sap is  important.
2. when we use bapi,
  we have to provide the user
(which is already in sap)
3. That use should
   have rights to
   do that transaction in sap,
  (other wise bapi will give error)
4. There is no concept of common user.
   There is only one user, one user,.... etc.
5. The user who uses the bapi to post data,
   should provide his own
  user id and password (of sap)
regards,
amit m.

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