Diary Goods receipt of milk scenario

Hi MM experts,

Implementing SAP in a Dairy , need help regarding mapping GR for MIlk (raw material)

Dairy Goods Receipt scenario is as given under:

Company(Dairy) collects milk through contract vehicle in cans on a specific route , all societies(vendors) supply milk in cans on daily basis

Milk rates are fixed on basis of its fat %.

Suppose one society has supplied 2000lit of milk , sample is drawn per 500lit, hence 4 samples will be taken , each sample is analyzed(QC) for fat & average reading is computed . based on this average fat rate is fixed.

Hence we will have to do GR without PO , thro 501 movement type, & rate to be taken as per qc check after fat determination.

Vendors do not supply their invoices , how to carry out invoice verification in this case? & How to carryout payment processing which is based on fat% ?

Also a specific truck carries milk from 10 different milk societies to the Dairy, how to get a report of milk transported by that truck? & How to compute the transportation charges to be paid to vendor (which are fixed for each route)

Suitable answers will be rewarded.

Regds

Sunil