I have a signed contract for fees for service and commission from sales. Client is now disputing contract and refusing past due payment, but has not initiated legal proceedings. I have money coming to me from vendors as payment for outstanding orders. May I subtract my commission and then apply the remaining money to the unpaid balance? Also, while the contract is in dispute, I am holding inventory. When can I dissolve this inventory to recover my holding cost? The contract does not outline non-payment contingency.