Thanks for the help, so far!

declare @SQLString nvarchar(4000)

set @SQLSTring = 'insert into aggr_Sales

(Price, NetPrice, SalesID, DealerID, DealerName, Month, ProductGroup, NetProfit, GrossProfit, Quantity, Quarter, Year)

select

Price, NetPrice, SalesID, DealerID,...

The sp_ExecuteSQL is core of our 'load-engine' which is perfectly generic this manner for our batch-processing(and won't be changed in the near future, because of impact)!

The insert statements...