VPN Setup - SD-WAN (load balancing)/pptp/Mikrotik

[cliango]

Hi members,

I am struggling with a VPN configuration.

We currently load balance 2 ISP connections using a SD-WAN.

I need to create VPN connections from remote sites (using pptp/Mikrotik) back to our Fortigate. 

However, it seems that once an interface is included in a SD-WAN interface, I cannot use it in my VPN setup.

Please help.