The figures every offer is priced with: daily rates, the exchange rate and price chain, the engineering hourly costs, the study reference prices and additions, and the budget price list of every product with its import duties and general increase. A change is never overwritten: it is kept with who made it, when, why and the date it takes effect. An offer is always priced with the figures in force on the date of its revision.
Every change, newest first. A change dated in the future can be withdrawn until it takes effect; the withdrawal is kept too.
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