Colissimo Shipping (France)

Hello,

i'm installing my first nopCommerce webshop and i encounter difficulties with the shipping methods.

In France we have a Colissimo service based on weight and countrie.
from 0 gram to 500 gram --> 5.55€
from 501 gram to 1000 gram --> 6.80€
from 1001 gram to 2000 gram --> 7.75€
...

I can't manage to do that with the Shipping By Country & Order Weight option. It takes me either a percent, either an amount by grams.

Even if the weight is 501 gram or 999 gram, customer pay the same (6.80€)

Thank you and sorry for my english.

Ok, i will developp an extension for this.

I manage to create a library based on the IShippingRateComputationMethod Interface.
I will implement this later (it's nearly the same implementation as the  shippingbyweightandcountry)

But my problem is at the data level. What do i have to do ? I don't want to use the same SQL dataTable.

Regards