Are you importing the IA's via CSV? A quick suggestion that I discovered that might help you: For each line of the CSV, create a unique "External ID" (I suggestion yyyymmddhhmm001, then yyyymmddhhmm002 - as it must be unique within the CSV AND within NS). When you import the CSV, map the field to the External ID and each line will be imported as it's own IA (yes you will have a load of IA's, so if that is an issue for you, don't do it). The advantage is that when one line on the CSV fails, the whole file doesn't fail. You will then be left with a list of lines that are the problem and you can easily (manually) fix those. I wouldn't do this for every import, but for IA's it works for us.