One Public IP Multiple Internal IP

Dear Forum!

I have one question for you:

I have one Pubilc IP which maps to several internal Servers and different Porst:

62.218.51.90 -> 192.168.15.233    Ports : TCP 1723 GRE(IP:47)

62.218.51.90 -> 192.168.200.253  Ports: UDP 5083 and 10000-20000

62.218.51.90 -> 192.168.15.240    Ports: TCP 4325

62.218.51.90 -> 192.168.15.236    Ports: TCP 25

How can i manage this because the Fortigate says to me its an conflict.