Inventory worksheet - error during generation (maybe a duplicate posting...sorry for which)

When generating an inventory worksheet, a customer receives the error 'The inventory worksheet contains errors or unposted data.  Do you want to generate a new inventory worksheet?"

My assumption is that they need to run DEP.  Is that correct?

Also, what happens if they just say 'yes' to generating a new worksheet?

This is Sage 300 v 2014.

(and I thought I had posted this a little while back but haven't seen it come through so reposting).

Thanks.