А если так написать?
SELECT max(ch.modifiedon) AS 'Дата', ch.new_commentary AS 'Комментарий', opp.name AS 'ВС'
FROM Filterednew_changeopportunity AS ch
INNER JOIN FilteredOpportunity AS opp ON ch.regardingobjectid = opp.opportunityid
WHERE (ch.actualend BETWEEN dbo.fn_BeginOfMonth(GETDATE()) AND GETDATE())
group by ch.new_commentary , opp.name
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