When I try to use the base line dimension tool in paper space it does not scale correctly. For example; Points on the drawing in model space are 100mm apart. I dimension (in paper space) to the first point from the datum and it displays at 100mm I use baseline for the next point and it displays correctly at 200mm then when I go to the next point the dimension shows as 190mm instead of 300mm. The same problem occurs using the continue tool. What is going wrong?