Case Management - table linking activities and cases

Hi.

I need to create a report in CRM that shows cases and the service orders that are linked to them.

I can get the case information from table CRMD_CMG_CASE_AT for example.

I can get the service order information from table CRMD_ORDERADM_H.

But how can I link the two tables?  Is there a table that contains both the Case GUID and the Order GUID?

Thanks in advance.

Ian.