Need to have the ability for dimension lines that cross other dimension lines be automatically masked. This has traditionally been done by adjusting extension lines, but with associative dimensions, this is not feasible. The order of dimension placement can control which is "over" the other dimension.
Wondering if you have tried using Level Priority? You can use Level priority and use a specific TextStyle with Masking [I have set up one TextStyle -> non-masking, one with-masking] and put it on the same Level as your Dimensions.