Filter Max Value By Two Columns

Hello numersoz 

select your transaction column, and launch the group function. Select there your new name of the date, function max and your date column

Here is the code

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WCijKTylNLlEwVNJRMjDUAyIjA6VYHUwJI3QJI4QOQ6wSxnpGRkqxsQA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Transaction = _t, Date = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Transaction", type text}, {"Date", type date, "de-DE"}}),
    #"Grouped Rows" = Table.Group(#"Changed Type", {"Transaction"}, {{"Date", each List.Max([Date]), type date}})
in
    #"Grouped Rows"

Copy paste this code to the advanced editor in a new blank query to see how the solution works.
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Kudoes are nice too

Have fun

Jimmy