Importing PowerPivot Data Model to PowerBI Desktop

Hello everyone,

I am currently trying to import my PowerPivot DataModel into PowerBI Desktop. I manage to import the data and create visuals but I cannot refresh any existing tables. I get the following error message:

Expression.Error: Column 'id' could not be found in table.

There are two columns in this exemplary table (id, supplier). When I check the advanced editor it seems that the error appears during the 'Rename Columns' step (I dont want to convert data types or change column names anyway). The columns given here are exactly the same as in sourceDB and PowerPivot.

let
    Source = Odbc.DataSource("Provider=MSDASQL.1;Persist Security Info=False;Initial Catalog=learnship;DSN=learnship"),
    #"Renamed Columns" = Table.RenameColumns(Source, {{"id", "id"}, {"Supplier", "Supplier"}}),
    #"Changed Type" = Table.TransformColumnTypes(#"Renamed Columns", {{"id", Int64.Type}, {"Supplier", type text}})
in
    #"Changed Type"

Any help would be highly appreciated.