I was doing a union of common data in KNA1 and LFA1 I renamed node to t_kna1 and t_lfa1,and I'm still getting the same error I think (not sure 'case I converted in 2 views now and deleted the old one) . For while I converted 1 view in 2 and now is working.
In my next view I'll try again using meaningful names to be sure.
Thanks a lot Christian.