Lock Assembly Orientation

Hi, Trying to lock my orientations for a bunch of Assembly views because they keep moving by themselves. Tried Locked orientation but its read only. Then just tried this built in parameter but get this. Any ideas?

image

If only i could code, got to get into this when i get time
http://www.revitapidocs.com/2017.1/460905b4-5f45-6a86-fa9e-fbcfcef2187d.htm