MASTER and SLAVE PICs using SPI in Oshonsoft

Hi,
I am trying to use an 18F4620 as MASTER and an 18F4431 as SLAVE in Oshonsoft using SPI.

There are other SLAVES connected to the MASTER e,g, BMP280 and a Compass module, all working ok and each has a C/S (Chip select). I have added a C/S for 18F4431 to the MASTER.

Now I'm trying to set up the 18F4431, as SLAVE.
Here is a link to some setup information: https://openlabpro.com/guide/spi-module-in-pic18f4550/

Any help welcome.

Camerart