I have just recently started using SAP DB, and am impressed with the range of features available, however I have encountered a problem when establishing referential integrity between primary keys.  Basically, I just don't seem to be able to do it.  As an Access developer, I find this extremely frustrating. 
 
I have yet to try this just using good old SQL, as I want to be able to do as much as possible through the GUI.  Is this a bug in SQL Studio, or am I missing something out?  Any help would be greatly appreciated.
 
Further info:  The problem occurs when trying to establish RI between TBL_STUDENTS (PK: Student_ID, Forename, Surname etc), TBL_ENROLMENTS (PK/FK: Student_ID, PK/FK: Course_Code, DateOfEnrolment) and TBL_COURSES (PK: Course_Code, Title, Level etc)
 
As I say, any help would be greatly appreciated.
 
Neil Benson



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