わかりました...もちろん、尋ねた直後に
;WITH XMLNAMESPACES (N'http://schemas.microsoft.com/dynamics/2006/02/documents/EntityKey' as DYN) SELECT IDENTITY(int,1,1) as 'ID', c .value('(DYN:KeyData/DYN:KeyField/DYN:Value)[1]', 'VARCHAR(40)') as 'JournalNum' INTO #tmpBatches FROM @ResultData.nodes('//EntityKey') t( c)