Recursive Bill of Materials Exists for Kit Error

Hi,

I'm trying to setup a new kit to apply to branches and when I try to add it I get error '023F - recursive bill of material exists'. Component item defined as parent.

This is the Kit Item:

There is only one component:

The kit is made up of 2x500cc component items. The 500cc item is also used in a BoM for two other products 250cc and 100cc (stocking type M).

Strangely the BoM can be Added in one Business Unit, but not another. Any ideas?