join table condition not working correctly

Hi,

I am using PostgreSQL databsae.

I have the following:

table A (id int, run_dt date , vrsn_num int, metric_1 varchar, attr_2 varchar);

primary key (id, run_dt, vrsn_num)

table B (id int , run_dt date, vrsn_num int, id_2 int , attr_5 varchar , attr_1 varchar);

primary key (id, run_dt, vrsn_num, id_2)

foreign key (id, run_dt, vrsn_num) references table A ((id, run_dt, vrsn_num)

when I drag the tables A and table B on to the Query builder, the default join condition is not built correctly

table A inner  join table B  on (table A.id = table B.run_dt and table A. run_dt = table B . vrsn_num and table A.vrsn_num -=  table B . id)

How do I ensure that the default join condition is built correctly ? Is this a bug?