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$result = $insert->execute();
...and see if there's anything informative in the result object.
Thanks for your hint. After analysing $result I found PEAR error 200; FielMaker error 200 would be "Record access is denied". So, I checked again my accounts and privileges, and found that editing the records of this table was allowed (as mentioned above), but not editing them via the layout that I use to access my FileMaker database. So, things work fine now.
Thank you very much for pointing out this way of getting information of what is going on.