Multiple VLANs on same port in an EPG

[dodgerfan78]

I am trying to put vlans 503 and 504 on leaf 101 port 1/2 in the web-epg. Why won't it let me? It says "already exists" but I can put another port:vlan combo in this EPG, I just can't put anything else on this port (Node-101/eth1/2). Also, if I go to another EPG, I can put another vlan on port 1/2 just fine. 

-Bryan

[girijagaunker]

would it be the same situation if it was a vPC instead of single port ?

[CristianP]

Yes I just bumped into the same and this is how I landed in this thread (searching an answer)
I do see an use case for what the OP is asking: I have hosts in 100 vlans , they are all hosting web servers (ports 443,80).
After moving the nodes to ACI I would like to be able to apply the same contract (allowing other hosts in other vlans to get access these servers) with one stroke. 
To me an EPG is an arbitrary group of nodes that have things in common. As of now this seems to be possible based on the same IP range (ext EPGs) or the same vlan/port. Since it is an arbitrary group why can't we pick the common denominator as we wish ?