Transit in HK to Beijing then next stop HK from Beijing

Hi,

So I have a flight that goes from Dubai to Beijing with a transit in HK (2 hour layover) as I'm flying Cathay. Then I need to go to HK before returning to London.

You said you can't have a HKG-PEK-HKG but this is really a DXB-PEK-HKG is it not?

Please advise. Many thanks in advance