Two Keylinks error

I have a table1 where the primary key are col1 and col2. In my
TIB_query.keylinks properties = col1, col2, when I prepare it, its
says it a invalid key? How do I suppose to fill the keylinks property?

But I have try filling up the keylinks property by this way....

col1
col2

instead of putting them in the same line seperated by a comma, I put
them in a seperate line. Is there any difference when I vice versa
the order of the column?