never mind my previous question, because you just check "parent".

Thanks.

Does your first query works for the child class under parent child relationship? I don't think there is an ID Key for the child table, but the first query still return the child table.

I got below working but I doubt this is really what I want. Although the query is accepted, I don't see how could I specify constraint name and 

real key property simultaneously. 

[SQL]SAMPLES>>ALTER TABLE TPCD.NATION ADD FOREIGN KEY (N_REGIONKEY) references TPCD.REGION(R_REGIONKEY);
87.    ALTER TABLE TPCD.NATION ADD FOREIGN KEY (N_REGIONKEY) references TPCD.REGION(R_REGIONKEY);

0 Rows Affected

Below is what I want:

ALTER TABLE TPCD.NATION ADD FOREIGN KEY NATION_FK2 (N_REGIONKEY2) references TPCD.REGION(R_REGIONKEY);

"NATION_FK2" is the constraint name and "N_REGIONKEY2" is the key property pointing to  TPCD.REGION.

Take another sample from your documentation:

PLEASE provide a working ALTER TABLE DDL which specifies both "StateFKey" and "State" in the query .

Class MyApp.Company Extends %Persistent 
{

Property State As %String;

ForeignKey StateFKey(State) References StateTable(StateKey);

}