Might be that he dont have enough security rights to write in your database. But then, it could be a lot other things as well.
access privilege error is a symptom of corruption not a cause
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We have a set up with about 300 users synching their iPads with one of our servers. A small percentage every year experience file corruption either due to a bad download or something seems to happen during the synch process.
Solution is to replace the damaged file. If there is data to be recovered because it may not have been synched back to the server successfully, you recover the copy on a computer using FMP Pro or Advanced and then import the data into a new copy of the file.