Alphabetic M-Code list

I am not sure if there is a slicker way, but you can create a blank query and use List.Sort and Text.Combine like below

let
    Source = Text.Combine(
        List.Sort(
            {"StockItem_ID","VatRateID", "VatRatePerc", "VatValue", "PriceIncl", "TotalVAT", "TotalIncl", "Category_ID", "Category_Code", "Category", "Subcategory_ID", "Subcategory_Code", "Subcategory1_ID", "Subcategory1_Code", "Variety_ID", "Variety_Code", "Packing_ID", "Packing_Code", "Size_ID", "Size_Code", "Grade_ID", "Grade_Code", "ProdAllocationID", "ProdAllocationCode","PriceExclDiscounted", "UOM_ID", "Supplier_Group_ID", "Supplier_Group_Code", "Supplier_Group", "Supplier_Group_Price_ID", "Supplier_Group_Price_Period_Start", "Supplier_Group_Price_Period_End", "Price_Per_Outer_Pack", "TotalCalculation", "Costing_Type", "Price_Per_kg","Subcategory", "Subcategory1", "Variety", "Packing", "Size", "Grade", "PackSize","Std_Wgt_Per_Outer_Pack", "Price_Week","Origin_Doc_Line_ID"}
        ), 
        ", "
    )
in
    Source

Then copy and paste the output into your query.