信用证的法律渊源、法律性质以及各方当事人的法律关系是信用证法律关系中的基础。
Sources and nature of law of letter of credit and the relationship of the parties are bases of .
关于信用证的法律性质在理论和实践上存在很大争议。
Legal nature of documentary credit is disputable in practice and theories.
备用证的作用和性质与跟单信用证是不同的，但长期以来备用证业务却依附于国际商会关于跟单信用证的国际惯例。
But for a long time, standby business has followed international customs of documentary letters of credit as stipulated by the international Commercial Committee (ICC).
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