Transform Data which has repeated column names but different values.

How is Power Query supposed to know what are "E-Items"  vs "S-Items" ?  Purely by their column order?

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("hU+xDoIwFPwV0hmSvragjCgksjhYBxPCUAkJgzAo/x/fYWk0DA7X3ru+d+/aNCIScUA992NUUWAqMB2YYXYs7AnXpSrr6/piw5wNc1Zvutu4EaWbe1ase/Sv0U3R2Y2oD083dcNXnv+Am6SEZKKkQjTHuDGwWDIQJcONQuNIvarRbvRH3vjckY9BaMXPjActbmC7/cL0j5eirVfHKPxmSn2wHEW+bsi9mqVrVjKibd8=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Column1 = _t, Column2 = _t, Column3 = _t, Column4 = _t, Column5 = _t, Column6 = _t, Column7 = _t, Column8 = _t, Column9 = _t, Column10 = _t, Column11 = _t, Column12 = _t, Column13 = _t, Column14 = _t]),
    Headers = List.Skip(Record.ToList(Source{0}),3),
    #"Converted to Table" = Table.FromList(Headers, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
    #"Added Index" = Table.AddIndexColumn(#"Converted to Table", "Index", 0, 1, Int64.Type),
    #"Replaced Value" = Table.ReplaceValue(#"Added Index",each [Column1],each if [Column1]="CASH" then Text.At(#"Added Index"{[Index]-1}[Column1],5) & "-Items CASH" else if [Column1]="CREDIT" then Text.At(#"Added Index"{[Index]-2}[Column1],5) & "-Items CREDIT" else [Column1],Replacer.ReplaceValue,{"Column1"}),
    #"Removed Top Rows" = Table.Skip(Source,1),
    #"Promoted Headers" = Table.PromoteHeaders(#"Removed Top Rows", [PromoteAllScalars=true]),
    NewHeaders = List.Zip({List.Skip(Table.ColumnNames(#"Promoted Headers"),3),#"Replaced Value"[Column1]}),
    Renamed = Table.RenameColumns(#"Promoted Headers",NewHeaders),
    #"Unpivoted Other Columns" = Table.UnpivotOtherColumns(Renamed, {"Date", "Salesman Name", "Branch"}, "Attribute", "Value"),
    #"Filtered Rows" = Table.SelectRows(#"Unpivoted Other Columns", each Text.Contains([Attribute], "-")),
    #"Split Column by Delimiter" = Table.SplitColumn(#"Filtered Rows", "Attribute", Splitter.SplitTextByEachDelimiter({" "}, QuoteStyle.Csv, false), {"Category", "Attribute.2"}),
    #"Pivoted Column" = Table.Pivot(#"Split Column by Delimiter", List.Distinct(#"Split Column by Delimiter"[Attribute.2]), "Attribute.2", "Value"),
    #"Changed Type" = Table.TransformColumnTypes(#"Pivoted Column",{{"CASH", Currency.Type}, {"CREDIT", Currency.Type}})
in
    #"Changed Type"