CRM Events

Hi,

I know that in CRM it is possible to attach custom (Z) function modules to the various standard events. As per the several documentations available on the internet, this can be done via transaction CRMV_EVENT. However, on digging a bit further, I found that via CRMV_EVENT transaction, the table that is populated is CRMC_EVENT_CALL (which in turn is a system table in terms of its delivery class). On the other hand, there is a Customizing table (delivery class C) called CRMC_EVENT_CUST which has the same structure as CRMC_EVENT_CALL and as per its short description, it is meant for maintaing custom function modules.

I am at a loss to understand the difference between the two aforemetioned tables. Can anyone please throw more light on what would be the implications of using one table over the another.

Thank you.