Change Speed and Duplex Ethernet ONT on OLT GPON Huawei MA5603T

Where there's request to change Speed and Duplex Port Ethernet ONT on OLT GPON Huawei MA5603T (for example to 100Mbps), it's actually simple to do. The default port-type is GE (1 Gigabit Ethernet / 1000Mbps):

Huawei_MA5603T#config
Huawei_MA5603T(config)#interface gpon 0/2
Huawei_MA5603T(config-if-gpon-0/2)#ont port attribute 4 5 eth 1 speed 100 duplex full <--- (Port 1 will be change to 100 from 1000)

Error "CFG_CMDBAPI_ERR" on Fortigate 200B

When You're trying to change config and save (example: change DNS) on Fortigate 200B then appears error "CFG_CMDBAPI_ERR", based on to the reference from googling: we can try to turn off  some features in UTM such as: IPS.