Thanks mjfarrel. I understand. I prepared a simple conditional link with SAC. The condition is simple. If the start point is under a defined surface, create a link. If the start point over the defined surface do not create the link. When I use my conditional link I add a generik link (vertical link) to my simple conditional link. After the creation of corridor, I get unwanted result. When my link's start point is under the defined surface my link is created. And my vertical link too. When my conditional link's start point is over the surface, conditional link doesnt created but the vertical link is created unfortunatelly.
I undersatand that the problem is Islayout mode problem. But I couldnt solve it. My sample pkt and dwg files are shared here.