Selecting value from different row

Hello - this will return the expected result.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjQyNjFV0lGKiIwCksYGYABkAZEhFDsX5RcX6yaXlpRk5qUrxeqgawIpM4XoMsCpxdTE2AgkExUZQaQ9sQA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [#"Project ID" = _t, #"Project name" = _t, #"Committed amount" = _t, #"Provided amount" = _t, #"KLM (Rio marker)" = _t, #"KLA (Rio marker)" = _t, #"Type of support" = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Project ID", Int64.Type}, {"Project name", type text}, {"Committed amount", Int64.Type}, {"Provided amount", Int64.Type}, {"KLM (Rio marker)", Int64.Type}, {"KLA (Rio marker)", Int64.Type}, {"Type of support", type text}}),
    #"Added Custom" = Table.AddColumn(
        #"Changed Type", 
        "Custom", 
        each let 
        varProjects = List.Select ( #"Changed Type"[Project ID], (x) => x = [Project ID] ), 
        varValues = 
            Table.SelectRows ( 
                #"Changed Type", 
                (x) => 
                    x[Project ID] = [Project ID] and 
                    x[Committed amount] <> null 
                    and x[Provided amount] = null 
            ) [Type of support]
        in 
        if List.Count ( varProjects ) > 1 then varValues{0} else null
    )
in
    #"Added Custom"