WASHINGTON — The Municipal Securities Rulemaking Board has drafted an interpretive notice warning underwriters of new bonds that they may violate the fair-dealing rule if they agree to eliminate a reserve fund or take other actions for the new bonds that could hurt existing parity bondholders, without authorization from bond documents.

“The MSRB is concerned that, in some cases, underwriters have consented to trust indenture or resolution amendments that affect existing parity bondholders, even though those authorizing documents and the official statements for the existing bonds did not provide expressly that underwriters could provide such consents,” the board said in the three-page draft notice it issued Tuesday.

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