More than one join condition for 2 tables in obiee

I am using obiee 11g.
There are 2 tables tableA and tableB where the join condition is like (tableA.col1=tableB.col1) or (tableA.col1 is null and tableB.col1 is null)
where should i do these type of joins.
I tried putting in physcial layer->f(x) but giving error like here only columns an d opertaors are allowed.

ok here it goes.
I have a tableA with columns col1(pk),col2 and other columns
I have tableB with columns col1(pk),col2..Only these 2 columns.
Now distinct tableA.col2 values are put in tableB.col2. For those distinct values i have put the tableB.col1 values.
Now tableA.col2 as well as tableB.col2 can be null beacuse there may be null values in tableA.col2.
Now in tableB i have added one more row which has col1 as value and col2 as null.
Now when in physical layer when i do tableA.col2=tableB.col2 i dont get the null values.
What i want is whenever the tableA.col2 and tableB.col2 is null then take tableB.col1 for those vales.
So when i query i do
select * from tableA,tableB where
((tableA.col2=tableB.col2) or (tableA.col2 is null and tableB.col2 is null))
What i want is when i do a join i should be able to give this OR condition in rpd thats it.
because when i do in where clause of content tab it goes like a AND condition and not OR.
Edited by: user123 on Jul 5, 2011 1:57 PM

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