Is this update query is possible

Question

update b set b.[NetSales] = b.[NetSales] - sum(a.[Amount Including VAT]) from [Sales_Cube_Source].[dbo].[Sales Cr_Memo Line] as a 
join [FactNetSales_Salesperson1] as b on a.[Sell-to Customer No_] collate SQL_Latin1_General_CP1_CI_AS=b.[Customer]
join [Sales_Cube_Source].[dbo].[Item] as c on b.[Division]=c.[Global Dimension 1 Code]
group by a.[Sell-to Customer No_]

Answer 1

it should be this
update b
set b.[NetSales] = b.[NetSales] - a.TotalVATAmount
from (
select [Sell-to Customer No_] ,
sum([Amount Including VAT]) AS TotalVATAmount
FROM [Sales_Cube_Source].[dbo].[Sales Cr_Memo Line]
GROUP BY [Sell-to Customer No_]
)as a
join [FactNetSales_Salesperson1] as b
on a.[Sell-to Customer No_] collate SQL_Latin1_General_CP1_CI_AS=b.[Customer]
join [Sales_Cube_Source].[dbo].[Item] as c on b.[Division]=c.[Global Dimension 1 Code]
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