Ar cle 765 Where, a er a debtor of an account receivable receives the no ce of assignment thereof, the creditor and the debtor of the account receivable agree to modify or terminate the underlying contract without just cause, which has an adverse impact on the factor, such modi ca on or termina on is not e ec ve against the factor. Ar cle 766 Where the par es agree that the factoring is one with the right of recourse, the factor may claim against the creditor of the account receivable for refunding the principal and interest of the nancing funds or redemp on of the claim on the account receivable, or claim against the debtor of the account receivable. Where a factor claims against the debtor of the account receivable a er deduc ng the principal and interest of the nancing funds and the other relevant expenses, any balance shall be returned to the debtor of the account receivable. Ar cle 767 Where the par es agree that the factoring is one without the right of recourse, the factor shall claim against the debtor of the account receivable, and the factor is not required to return to the creditor of the account receivable the amount in excess of the principal and interest of the nancing funds and the other relevant expenses he has obtained. Ar cle 768 Where a creditor of an account receivable concludes mul ple factoring contracts with di erent factors so that the factors claim their rights against the same account receivable, the account receivable shall be obtained by the factor of a registered factoring contract in priority over the factors of unregistered factoring contracts, or, where all factoring contracts are registered, by the factors in an order according to the me of registra on, or, where none of the factoring contracts have been registered, by the factor stated in the transfer no ce which has reached the debtor of the account receivable rst in me. Where none of the factoring contracts have been registered and no transfer no ce has been sent, the account receivable shall be obtained by the factors on a pro rata basis on the amount of nancing funds each has provided, or the service remunera on each is en tled to. Ar cle 769 For ma ers not provided in this Chapter, the relevant provisions of Chapter Six of this Book on the assignment of claims shall be applied. Chapter XVII Work Contracts Ar cle 770 A work contract is a contract under which a contractor, in accordance with the requirements of a client, completes a work and delivers the work product to the client who pays remunera on in return. A contracted work includes processing, manufacturing on order, repair, reproduc on, tes ng, inspec on, and the like. Ar cle 771 A work contract generally contains clauses specifying the object, quan ty, and quality of the work, remunera on of the work, the mode of the work, supply of materials, the period of performance, the standard and method of inspec on, and the like. Ar cle 772 The contractor shall complete the principal part of the work with his own equipment, technology, and labor force, unless otherwise agreed by the par es. Where a contractor entrusts the major part of the contracted work with a third person, the contractor shall be accountable to his client concerning the work completed by the third person and the client may rescind the contract if he has not consented thereto. Ar cle 773 A contractor may entrust the accessory part of his contracted work with a third person. Where a contractor entrusts an accessory part of the contracted work to a third person, the contractor shall be accountable to the client concerning the work product completed by the third person. Ar cle 774 Where a contractor is to provide the materials, he shall select and use the materials in ti ff ti fi ti ti ti ti ti fi ti fi ti ti fi ft ti fi ti ti ti ti ti ti ti ft ti tt ti ti ti fi ti ti ti ti ti ti ti ti ti ti ti ti ff 83