Routing beetwen VPN with NAT

[Bezze87]

Good Morning all, 

I'm facing a problem routing traffic between two vpn, because in one i need to NAT all the objects. My checkpoint gateway is the one in the middle between different brand's firewalls. 

VPN_A is a domain based VPN. 
peer_A network_A: 172.29.70.0/24

nat_network to use: 172.29.71.0/24 

different object behind my_gateway natted one to one: 

1) 10.10.4.34 -- natted 172.29.71.34

2) 10.11.4.47 -- natted 172.29.71.47

other object behind peer_B natted one to one: 

3) 10.200.4.33 -- natted 172.29.71.33

VPN_B is a domain based VPN

peer_B network : 10.200.4.0/23

When i try comunication from host 1 or 2 no problem also from network_A no problem with host 1 or 2

When i try comunication from host 3 no problem to reach host on network_A  the opposite from network_A i cannot reach host 3. 

As you see in the image attached: 

1) is the comunication going correctly from host_3 to an object of network_A

2) is reverse comunication that is blocked on my gateway and isn't routed throught VPN_B.