Wis. Stat. § 409.401
The above annotated materials cite to the pre-2001 Wis. Act 10 version of ch. 409.
If a security agreement does not explicitly provide that transfer of collateral constitutes default and the secured party is not entitled to immediate possession, sale of collateral is not a conversion. Production Credit Association of Chippewa Falls v. Equity Coop Livestock, 82 Wis. 2d 5, 261 N.W.2d 127 (1978). A condition imposed by a secured party on authorization to sell collateral is ineffective unless performance of the condition is within the buyer's control. Production Credit AssociatIon of Madison v. Nowatzski, 90 Wis. 2d 344, 280 N.W.2d 118 (1979).