The creditor has no right to dominate the property of the debtor directly, because his right is a claim. He is only allowed to request that the debtor performs his obligations and not claim his rights against the third party. 因债权为请求权,债权人对于债务人的财产没有直接的支配权只能请求债务人履行义务;不能以债权对抗第三人。