Hi

we are factory that our product build from raw iron profile like ladder or tower 

We buy raw material (Iron profile) with kg. and use them in manufacture by meters and convert them to product with unit . final product contain a lot of this little parts and want to sell them with both unit or kg.

every 1 kg of A profile is 2m every 1 kg of B profile is 1mevery 1 kg of C profile is 0.5mand so on ....

in production 

product A1 one unit = 20 cm of Aproduct A2 one unit= 10 cm of Aproduct A3 one unit= 180 cm of Aproduct B30 one unit= 110 cm of Band .......

e.g. final product Towen-model-102 = 2*A1 + 3A2 + 10*B30

i want to sell final product in kg and unit

i set kg as "purchaser unit of measure" and M as "unit of measure".

is there any way to set "measure ratio" to product instead of a unit ? this way i think i should create a UoM for each product (raw product have different ratio with each other)

i think the current solution of odoo is that 

1- create a unit of measure category2- create a unit of measure with the name kg and type of this unit should be "reference unit of measure for this category"3- create another unit of measure like this "m-for-A-profile" and set type "bigger than the referebce unit of measure"4- repeate number 3 for every single profile and create "m-for-B-profile" and .... so on over and over and set ratio.

I think this would be very nice if ratio filed was a part of product_product table . user will select unit of masure, if unit was from diffrent category ratio filed appear . very simple. 

by reading my problem is there another bussiness or factory that have same problem. i need help

tanks every one to read.

regards