Hi mala,
your objects need trimming before you can join them.
They stick thro the base plane and therefore stick thro the target plane.
So trim the objects and target plane then join.
That's if I understand what your trying to achieve.
Cheers
Barry

Hi Barry,
I let the two objects on the base plane pass through so that they would also pass through the curved surface everywhere during the flow operation.
I remember that if they didn't pass through during the flow operation, there were difficulties cutting the surfaces further down the line.
Mala

I´m clear now. The problem was, I think, that i did the trim operations for the both applications. Now I did it step by step and it worked.
Thanks for your empathies...
Mala