Dynamic Data Source Error / RelativePath / Cursor Pagination / Headers

Hi MichaelMM 

I tinkered around a bit and I was able to "Test connection" in the Power BI Service with this version of the query:

let
  Kilde = List.Numbers(250000, 160, 1000),
  #"Konverteret til tabel" = Table.FromList(Kilde, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
  #"Ændret type" = Table.TransformColumnTypes(#"Konverteret til tabel", {{"Column1", type text}}),
  #"Tilføjet brugerdefineret" = Table.AddColumn(
    #"Ændret type",
    "Brugerdefineret",
    each Json.Document(
      Web.Contents(
        "https://apis.e-conomic.com",
        [
          RelativePath = "bookedEntriesapi/v3.2.0/booked-entries",
          Query        = [cursor = [Column1]],
          Headers      = [#"X-AppSecretToken" = "XXX", #"X-AgreementGrantToken" = "XXX"]
        ]
      )
    )
  ),
//...

Does this work for you?