When raising an invoice or sales order , I have the ability to come up with any item details I want which is not right . For instance instead of Nike_test my intern spelt out just Nike (note this doesn't exist in my inventory list ) and he was able to issue an invoice . I checked this out and it and I was able to do the same thing . When such entry is done out doesn't affect stock balance neither does it affect the committed stock and this poses a serious problem .

How do I prevent this from happening?