Error: 200 message - how do I resolve this?

[gwjo]

I have set up a database with guest access and the privilege set to allow the creation and editing of records and with guest account set up as the entry point. The system is set up using php with fmphp enabled and I can view and find records but not edit them. The error message is: Error: 200 - Record access is denied, which suggests a privileges violation. If anyone has a checklist or similar to troubleshoot the access problem, I'f be very grateful.

regards,

George