Hi Andrew, I am not a great expert on MRP - But I know some Axapta customers running MRP without any problems - with thousands of multiple level BOMs and tens of thousands of items. As with everything else, I guess this is mostly to do with the way it has been configured. As I mentioned in my earlier reply, I will begin with checking circularity and then running consistency check against items/BOMs. Could you please try this at your end and let us know how it went. Regards, Harish Mohanbabu