I run into that error since I went live. what it is telling you is that the material you are trying to buy is not allowed. to get past this error you need to go job entry and call up the material entry. on that page you will see a purchase direct check box, check it, save and then go back to your PO and try it again, you will not get the error.
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]