WASHINGTON — The Municipal Securities Rulemaking Board released draft rule changes Thursday that would prohibit municipal securities dealers from consenting to alterations in bond authorizing documents, except in very limited circumstances.

The proposal, which would amend Rule G-11 on primary offering practices, replaces an interpretive notice on Rule G-17 the MSRB issued in February. It warned dealers they could violate fair-dealing requirements if they consented to certain changes to bond authorizing documents. That notice was less restrictive.

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