How can I create an auto-incrementing ID field for a web app?

I have a web app for a project database. Customers can login and add a new record to the web app. We need it to provide each new project with a unique and sequential number. The BC ID number for each web app item is unique but of course not sequential (and too long). So for example the client would like all project IDs to be 4 digits starting from 1000. Any ideas?
Thanks in advance!

Kapowaz,
Just thinking out loud, I wonder if you could use an Automator action to find the last invoice created and open a new file with a name based on incrementing a part of last file's filename. This would make the filename the same as the invoice number and you would still have to transfer the file's name to the content of the file.
If I had this need, I think I would create an Invoice Log document. It would be easy to have a table into which you would enter identifying data and date and have the table generate a new invoice number that you could paste into the current invoice document. It would kill two birds with one stone if you need an index of your invoices.
Jerry

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