(b) The receivable is not fully earned by performance and either the modification is provided for in the original contract or, in the context of the original contract, a reasonable assignee would consent to the modification.
(b) 履约不足未挣得全部应收款以及原始合同中写明可作修改，或根据原始合同，通情达理的受让人会同意此种修改。