/**
 * Specifies the letter type as published in an external letter type code list.
 * ISO20022 External Code
 * Original name: ExternalLetterType1Code
 */
export declare enum LetterType {
    /** Document is a letter from the bank. */
    LFBK = "LFBK",
    /** Document is a letter to the bank. */
    LTBK = "LTBK",
    /** Document is a supporting document. */
    SUPP = "SUPP"
}