Looks like you will need to edit that parcel and add the line then delete the curve. I know that's not what you want, but it is a work around.
Perhaps I'm not reading this correct or are we the only ones who DO use curves in parcels?
Our subdivision parcels follow the road. If we made all roads perfectly straight, we wouldn't be in business. Our roads curves around for a number of reasons. And in some municipalities our parcel has to go to the center of the road.
Just about any legal description I have come across has curves described. So, I'm at a loss in the this thread.
I blog at EE: http:\\www.civil3d.com
It is evidently something peculiar to Latvia. At least, I've never encountered anywhere that prohibits curves in Parcels. This post was the first I'd ever heard of it.