The Convention which is done by an institution, should be an agreement about unit prices for the execution of works, usually always the same, which is OK for both parties.
From time to time, with prices in the Convention should make a list of what needs to be done to quantify and then proceed with the work.
In reality, 'the customer, classically, it looks at the work to be performed in each case, but it is a calculation of cost per square meter on the basis of the convention and wants to apply it to the mat.
enough that you did a bit 'of tests of details to understand that companies can not work at a loss and would be saved long and stressful discussions ...
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