Changing data connection from ODBC to SQL

The last line should just be :

#"Filtered Rows1"

Also, for some reason you changed the names of some of your steps but are still referring to the old steps.

Old

Source = Odbc.DataSource("dsn=Dataext", [HierarchicalNavigation=true]),
data1234_Database = Source{[Name="data1234",Kind="Database"]}[Data],
dbo_Schema = data1234_Database{[Name="dbo",Kind="Schema"]}[Data],
ttfacr200140_Table = dbo_Schema{[Name="ttfacr200140",Kind="Table"]}[Data],
#"Renamed Columns" = Table.RenameColumns(ttfacr200140_Table,{{"t_ttyp", "Document Type"}, {"t_ninv", "Document Number"}, {"t_itbp", "Invoice to BP"}, {"t_docd", "Document Date"}}),

New

Source = Sql.Databases("177.101.5.67\Dataext"),
data1234 = Source{[Name="data1234"]}[Data],
dbo_ttfacr200140 = data1234{[Schema="dbo",Item="ttfacr200140"]}[Data],
#"Renamed Columns" = Table.RenameColumns(ttfacr200140_Table,{{"t_ttyp", "Document Type"}, {"t_ninv", "Document Number"}, {"t_itbp", "Invoice to BP"}, {"t_docd", "Document Date"}}),

I'm not sure why you changed your query up like that but you are referring to steps that do not exist in your query and that's going to cause problems. The idea was to swap out the Source line and the Source line only.