inventory error message

I am using items (raw materials) on a Production BOM in NAV 2013 manufacturing. I am producing a product using these materials. I am using a routing with a routing code. I have set a flushing to backward flush. I have plenty of material in inventory.

I get the error message: ‘item (raw material) is not on inventory’

Why would I be getting this message?

Check whether material available on the location you are using …

Amol. Your solution was correct! Thanks very much for your help.