We encouter the problem about selling product to Government which is a biggest customer.
The scenarion is, we've to sell the product with the base price first, but the index price will be annouced 2 months later therefore we have to create credit/debit note to adjust the base price to be index price.
We usually have to create credit/debit reference from billing more than 1,000 documents per months because if we do lump sum it will not reflect to the correct selling price of product and marketing team cannot analysis.
So there are any standard functional such as rebate, sales deals.... or anything else that can apply.
Our constaint are
1. We don't know the final selling rate during create Sales Order
2. The base price can more/less than index price (so both Creit/ Debit)