ARPs & ACPs

Guys,

i am having problem of adding ACPs & ARPs to my assembly. Was browsing a bit on the internet but, as usual, i was not able to find an answer. The only thing up are the standar ways of adding them which does not work for me.

I have a unit modeled out of 1 part and 3 flanges mated to it. When i want to create ACP i can pick only existing ones, which are no good since flanges have only one CP. If i want to create it by picking the face of the flange it will not work. I also tried with sketched point. Sketch was created as a new sketch inside my part. It wouldn't pick it up. Same goes for ARPs..

any help is appreciated

SolidworksRouting