Check table

Hi Guys,

I have 2 ztables. Ztab1 & Ztab2. Ztab1 has 3 primary key fields and ztab2 has 2 primary key fields. One if the primary key field is referring ztab1, so i have created as check table for that referring to ztab1.

Is there any condition or process, that ztab2 should have all the primary fields which are present in ztab1 to refer it as check table? please help me out. Thanks.