Difference between service and communication user

Hi,
We ran into a big problem in our CRM system getting millions of Dynpro_Send_in_background dumps while processing inbound queues R3AD* from R/3 system to CRM. Lots of Updates getting failed with CRM_SCHEDLIN_UPDATE_DU function module while executing report LCRM_SCHEDLIN_DUU01.
Error Details - CRM_ORDER_MISC 002: Error in updating object SCHEDLIN
We posted to SAP as well but did not find root cause. SAP saying we need to change RFC user "S_ECC_PR0400" from Service user to Communication user, that would stop the dump problem.
I want to know what is the unique difference between these users(Service & Comm) which will resolve the dump problem though I know the common difference between these users.
Thanks
Anju

Hi Anju ,
Communication 'C' User :
Use the user type Communikation for dialog-free communication between systems (for RFC or CPIC service users of different applications, for example, ALE, Workflow, TMS ZBV).
Dialog logon is not possible.
Service 'S' User :
A user of type Service is a dialog user available to a large anonymous set of users. It usually has closely-restricted authorizations.
Service users are e.g. used for anonymous system access via an ITS service. You can change a session which began as an anonymous session with a service user into a personal session under a dialog user with an individual authentification.
There is no check for obsolete/initial passwords at logon. Only the user administrator can change the password.
Multiple logon is allowed.
Hope this may help you.
Thanks
Gyan

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