OPIM - Tapping connection sizes limitation?

It seems there is a limitation on size when doing tapping. When I have larger different on tapping sizes (such as 2"x1"), OPIM has no problem, but when tapping sizes different is less or equal to 1/2" (such as 2"x1+1/2" or 1"x3/4"), OPIM failed. 

Is some setting/switch controlling this sizes limitation/difference? 

And here is how to reproduce the issue:

1. place a 2" flange

2. connect flange with a flange blind

3. tap on flange blind with size 1+1/2"

4. place a plug on the tap point

5. run OPIM and it failed with message "ERROR[0]: Tap point on component can not be associated with component segment"

6. Repeat above step with 1" tap point and 1" plug, OPIM is a success.

Thanks,

Maggie