Hi,
I think in all the system( ISU non-ISU) conditions records are selected based on Access sequence - Access number thing. Now the basis of selection of a particular condition record starts at organizational level (Sales Org. , Distribution Channel ). The below links might interest you.
http://help.sap.com/saphelp_46c/helpdata/en/dd/56178c545a11d1a7020000e829fd11/content.htm
http://help.sap.com/saphelp_46c/helpdata/en/f0/b5d468077c11d3ad020000e8a5bd28/content.htm
Also check the button graphic in SE11.
That gives you the relationship in tables by the keys they share so would give you the tables of origin and the shared relation among them similar to
Cheers,
Arindam