同时，应当区分产生被让与债权的合同、债权让与的原因合同、债权让与合同、债权让与等几个概念的不同内涵。
Contract that creates the credit, cause of credit-assignment, contract of credit-assignment, assignment of credit, are several different concept.
债权让与涉及让与合同外的债务人和第三人利益，因此其在让与双方间生效后存在一个对外效力问题。
Right assignment is relates to the debtor's and the third party's interests, so after has the internal validity between contract parties, it also should has the external interests.
让与合同生效，在合同当事人之间产生债权变动，以及从债权的转移，并产生让与合同之债。
The effect of the transfer of contract is to make the change of creditor's right between two parties of contract and from the assignment of credit, the debt of the transfer contract arises.
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