How to trap arguments passed in to procedure...

I am trying to troubleshoot an error occuring in a web application. The app calls a stored procedure that I wrote. When I pass in the arguments via sqlplus/toad whatever, I am unable to generate the error. The web developer swears up and down that the values she has send me are being passed. I attempted to enable a 10046 level 12 but that doesn't show the argument values passed in to the procedure. How can I do that?

chris

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