Qualiflyer - Iberia - spending miles (no mix with other QG airlines?)

I tried to book free ticket on route Warsaw - Palma de Mallorca via Madrid(stopover). Qualiflyer agent told me it's impossible to fly LOT Polish Airlines to Madrid and then Iberia to PMI. What can I do ?

Interlining is only possible with TP, Tapair

Fly Swiss andor SN, they allow 1 stopover, eg. War-ZRH-MAD-BRU-PMI
and return PMI-BSL-WAR

Thanks Michilo, I toutght about it, but with a Swiss schedule I have to spend the night in ZRH. Other thing - aiprport charges (in Zurich about 40 USD +Swiss get 5USD per segment (insurance).

my proposal does not avoid high taxes and security charges. But, it should be possible to avoid the night stay in zurich. have u tried with sn bru, tap and swiss via basel or zurich? you can combine those qualiflyer airlines!