nat incoming source with MIP (ScreenOS)

Our network 192.168.10.0/24 (netA). Partner network 192.168.1.0/24 (attach topology). 192.168.10.10 (serverA) is our server. We have some partners have same remote LAN: 192.168.1.0/24 (netB). Iam testing a VPN  site to site case to ovoid overlap  in remote LAN network.

I have succesfully config network netB connect to serverA through ip 192.168.100.10 (MIP(192.168.100.10)=192.168.10.10)

I try to config network netB connect to serverA , it will become DIP(10.255.1.10) to MIP(192.168.100.10).

Could you help me?

Thanh you!