Reports 10g R2 error using parameter form

I am trying to run some reports that are being called from a form (using REPORT_OBJECT). If I set PARAMFORM=YES, I get a HTML parameter form that look correct. When I click the Submit button, I get a 'HTTP 500 server error'
Are parameter forms supposed to be working in 10g?

Hello,
Yes and it is documented in the PDF :
http://www.oracle.com/technology/products/forms/pdf/10g/frmrepparamform.pdf
Have you checked the HTML source of the parameter form ?
What is the value of the attribute ACTION in the element FORM ?
Regards

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