Editing Assignment (law) (section)

===Breach and defenses===
A cause of action for [[breach of contract|breach]] on the part of the obligor lies with the assignee, who will hold the exclusive right to commence a cause of action for any failure to perform or defective performance. At this stage, because the assignee "stands in the shoes" of the assignor, the obligor can raise any defense to the contract that the obligor could have raised against the assignor. Furthermore, the obligor can raise against the assignee counterclaims and setoffs that the obligor had against the assignor. For example, suppose that A makes a contract to paint B's house in exchange for $500. A then assigns the right to receive the $500 to C, to pay off a debt owed to C. However, A does such a careless job painting the house that B has to pay another painter $400 to correct A's work. If C sues B to collect the debt, B can raise his counterclaim for the expenses caused by the poor paint job, and can reduce the amount owed to C by that $400, leaving only $100 to be collected.

When the assignor makes the assignment, he makes with it an [[implied warranty]] that the right to assign was not subject to defenses. If the contract had a provision that made the assignment ineffective, the assignee could sue the assignor for breach of this implied warranty. Similarly, the assignee could also sue under this theory if the assignor wrongfully revoked the assignment.