PQ - Merge two tables with subtraction

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:

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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

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