Hello good members of this community, 

I am wanting to create a TCP Safety Zone using the TCP Safety Zone command, with the Safety Zone looking like below:

However, because one of the sides has an internal angle greater than 180 degrees, 3DX is not allowing me to position the points that achieve this shape, the points refuse to move when the internal angle created reaches 180 degrees. As a result I am forced to divide the Safety Zone into two so that any internal angle doesn't exceed 180 degrees. 

 

What I would like to know, is this a limitation of 3DX or me doing something incorrect or a setting that can overcome this ? 

Would appreciate any leads,

Thanks !

Regards,

Omar