Robert, 13:09 Oct 19, 2010
The term "a origen" in this context just means that the invoices or payment certificates issued by the contractor (subcontractor in this case) must reflect the total work performed since the beginning (or origin in time) of the contract and not just the work performed in the period of time to which the invoice refers. This is normal practice in "progress billing", but is not is not a translation for "progress billing". "Progress billing" in this context, means that the construction is billed and payed as it progresses, in partial payments every certain time, as opposed to paying at the end when the project is completed.
"A origen" (cumulative work) means that if, for instance, a company installs 1000 m2 of flooring per month, the payment certificate in the 5th month will have to show a total of 5000 m2 of work completed, and not just 1000 m2 as being done that month. Then of course, the company will have to deduct from that quantity the previously invoiced work (in this example, in normal conditions the company would have to deduct 4000 m2 from the previous months), to arrive to a bottom line amount that reflects the work actually done that month. | 
The translation workplace 
peer agreement (net): +3
