4. If a receivable is assigned pursuant to a contract of assignment concluded before the date when this Convention enters into force in respect of the Contracting State referred to in article 1, paragraph 1 (a), the right of the assignee has priority over the right of a competing claimant with respect to the receivable to the extent that, under the law that would determine priority in the absence of this Convention, the right of the assignee would have priority.
4. 如果一笔应收款是根据在本公约对第1条第1款(a)所述缔约国生效之日前订立的转让合同转让的，则根据无本公约时确定优先权的法律受让人权利具有优先权的，受让人对该笔应收款的权利相对于竞合求偿人的权利具有优先权。