Wis. Stat. § 411.514: Waiver of lessee’s objections.

(1) In rejecting goods, a lessee’s failure to state a particular defect that is ascertainable by reasonable inspection precludes the lessee from relying on the defect to justify rejection or to establish default if any of the following circumstances exists:

(a) The lessor or the supplier could have cured the defect if the defect had been seasonably stated.

(b) Between merchants, the lessor or the supplier, after rejection, made a request in writing for a full and final written statement of all defects on which the lessee proposes to rely.

(2) A lessee’s failure to reserve rights when paying rent or other consideration against documents precludes recovery of the payment for defects apparent in the documents.