If you are working with sales order and want to control is an order is stopped there are a few options with the order holds, or stopping the lines. If you want to stop and item from being added to the order in the first place then you could have a look at the stopped flag on the default order settings for the item or at the site settings.

Here is a quick overview.

AX2012 R3 CU9.

Cheers

Lachlan