AX2012 - Intercompany

AX2012, CU4, - Intercompany order ..

Hi .. Am looking for some inspiration, if possible  

Item has a dimension group with site / warehouse and location active.

I can process an intercompany order – no worries, no issues.

I can process a direct delivery to an outside supplier – no worries, no issues..

I can’t process an intercompany order as a direct delivery – because AX complains of the dimension group.

I know the reason, it’s because the location is active (works on other items without location active)

What I don’t understand is why?

Any thoughts please?

Thanks

Martin