发出预先通知的开证行应不可撤销地承诺将不延误地开出有效的信用证或修改，且条款不能与预先通知书相矛盾。

An issuing bank that sends a pre-advice is irrevocably committed to issue the operative credit or amendment, without delay, in terms not inconsistent with the pre-advice.

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只有准备开立有效信用证或修改的开证行，才可以发出开立信用证或修改预先通知书。

B. A preliminary advice of the issuance of a credit or amendment (" pre-advice ") shall only be sent if the issuing bank is prepared to issue the operative credit or amendment.

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兹附寄第50号信用证的修改通知书。

We enclose amendment advice of L/C No. 50.

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