Autopipe vessel reducer / cone shell with flange

Hi gentlemen,

Just today my boss asked me to draw a vessel but I have a problem.

Basically, apart the nozzle and others fitting, this has a cilinder shell + reducer ( from 24" to 12") and a flange in the end. When put reducer between flange and shell the software says that one diameter is missing and has to be change with cone. I did it but then when put the flange on cone side the software says "flange must be on the shell" . How I can resolve this.

Thanks

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