SELECT [IW47 Local TBL].Registration, Format([IW47 Local TBL]![Created On],"mmm yyyy") AS Period, Sum([IW47 Local TBL].[Actual work]) AS [Actual work]
FROM [IW47 Local TBL] INNER JOIN [Registration - CS - Orders] ON ([IW47 Local TBL].Order = [Registration - CS - Orders].Order) AND ([IW47 Local TBL].Registration = [Registration - CS - Orders].Registration)
GROUP BY [IW47 Local TBL].Registration, Format([IW47 Local TBL]![Created On],"mmm yyyy")
ORDER BY Format([IW47 Local TBL]![Created On],"mmm yyyy");