Merge two tables with subtraction

Sources Result
Code Cost Code Cost FMV Adjustment
10203006
3528377.92
 10203006
3528377.92
3528377.91
0.01
30703001
1666190.34
 30703001
1666190.34
1273727
392463.34
Ycode FMV
10203006
392041.99
10203006
130680.66
10203006
392041.99
10203006
2613613.27
30703001
1157933.64
30703001
115793.36


Code:
let
    Tbl1 = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
    Tbl2 = Excel.CurrentWorkbook(){[Name="Table2"]}[Content],
    Merge = Table.NestedJoin(Tbl1,{"Code"},Tbl2,{"Ycode"},"Tbl2",JoinKind.LeftOuter),
    FMVList = Table.AddColumn(Merge, "FMV", each [Tbl2][FMV]),
    Expand = Table.ExpandListColumn(FMVList, "FMV"),
    TSC = Table.SelectColumns(Expand,{"Code", "Cost", "FMV"}),
    Group = Table.Group(TSC, {"Code", "Cost"}, {{"FMV", each List.Sum([FMV]), type number}}),
    Adj = Table.AddColumn(Group, "Adjustment", each [Cost] - [FMV], type number),
    Type = Table.TransformColumnTypes(Adj,{{"Code", type text}, {"Cost", type number}})
in
    Type