Top down distribution base in copa

Dear all,

I am facing problem in top down distribution in copa, My scenario is like below:

I done top down distribution for freight value field of record type D( cost coming through copa assessment cycle) the cost is 75,621,096.07INR, in KE28 distribution i select the period and record type D in actual data, selected period, actual data, and record type F( values from sd billing) in reference data and select the reference base as sales quantity of the same period, in processing instructions i select the division from "CPY" and product in "DLVL" in value fields selection i select the freight value field and in selection criteria i took * for all.

The distribution has been executed successfully and it is showing zero in unassigned in ke30 report, when i done further drill down to know how the distribution happened on the basis of sales quantity of the same period. I am unable to figure out the distribution base.

1) Please advise me the distribution logic for freight cost if i considered sales quantity.

2) If i am doing anything mistake please correct me.

Regards,

Ravi.