Production. Component consumed, but vendor unknown

hi guys,

I person a script which I americium not definite however to code with SAP MM/CO functionality. "technically" it is akin to the energy but...more dynamic. 

The script is - multilevel production. At definite constituent they devour definite component, and publication the outgo to their FERT products.

  BUT.

At this constituent it is not wide who is the vendor (they spell to Exchange to bargain the said component, that tin instrumentality a week, a period , up to a year). That makes it hard to travel accepted GR IR process.

So. They privation debit stock/credit liability. Liability to beryllium adjusted monthly according to marketplace prices. 

Playing with invoice-to-party partners was rejected, due to the fact that liability reducing is benignant of not posible. 

I americium present exploring pipeline material.  More ideas are welcomed. 

thank you.
Laimonas