Hikvision Intrusion Detection 'The Camera does not support this function'

I have a DS-7208HUHI-K1 with a DS-2CE56H1T-ITME Camera.

Using iVMS-4200 to configure 'Smart Event' \ 'Intrusion Detection'. However, when checking the box to enable the setting and clicking 'Save', I get a pop up error message 'The camera does not support the funtion'.

Oddly enough, I can use iVMS to enable this feature on my other cameras which includes an older Qvis dome camera.

Any suggestions as to what I may have missed?

Thanks