Modifiers and tax issue

Hi all,

I have 2 questions/problems:

1. Is is a standard feature that when creating modifier in one operating unit, I cannot use it in another one on a Sales Order, although I can see this modifier on the modifiers form from this second operating unit? Maybe I just missed something when creating modifier..? 

2. Invocies are created from sales orders imported from OM. What may casue that tax on invoice is not taken from sales order but it is default tax rate defined in E-business tax module

Thanks in advance for help.

Regards

Tomek