Shawmut Construction asks their subs to sign a lien waiver and send it with their payment application. Here's one of the lines from the waiver: "The undersigned has received payment in full, less Retainage, if any, for all labor, services, materials, fixtures, apparatus, and/or equipment furnished in the construction of the Project through the above Application for Payment Period and there are no outstanding claims against Shawmut Design and Construction, and/or its sureties, or the Subcontractor/Supplier, in connection with the Project." It sounds like they're asking me to say that I've already been paid...in order to get paid. Is it legal for them to ask a sub to sign this before payment is actually made?