Very slow - part status

Hi Jamie,

Interesting question, would be interesting to hear from other customers, how they manage very slow movers when it comes to MRP.

And yes, it has an impact on MRP performance. How many parts that are loaded into MRP does matter. BUT when writing about this, the main drivers for MRP performance are:

• Number of open Customer Order Line Demands (or other independent demands for your products)

• And if you use master scheduling - number of master schedule receipts (dependent on number of distinct forecast events)
• Number of components in the BOM (not so much the depth of the BOM)

Because this situation will create all those MRP planned supplies and demands.

If you want to exclude a part from MRP, and hence improve performance a little bit, you can assign the part to an Inventory Part Status which has “Demand Not Allowed”.

You can also use the not so known MRP Control flag which you find in Manufacturing Part Attributes. If you unselect this flag, the part will be excluded from MRP.

Working with Inventory Part Status is somewhat nicer I think.

There is another interesting flag for MRP in basic data for Inventory Part Status and that is the Supply Allowed flag.

For a part which is connected to a part status where demands are allowed and supplies are not allowed, MRP will see this guy, but it will not create any MRP planned supplies for it.

We should not forget about query performance in MRP Actions Proposals screens. If I quote you Jamie “...Looking at the date over two thirds of the messages are ‘ No Demand Exists’ for parts with a frequency class of Very Slow...” => Getting rid of all these parts from MRP engine will also get rid of the two thirds of the messages ‘No Demand Exists’.

-Mats