Display messages from PL/SQL?

I am running some PL/SQL code from Application Builder > Page Definition > Processes After Submit > Source. Can the PL/SQL code be written to display messages (like the Messages attribute does)?
I tried using htp.prn, but couldn't make it display. How do you do it?
Thank you.

Wolfram,
Since your process is running after submit any calls to htp.prn will not be displayed. In order to see your messages you either have to run your process before header or at any of the other processing points during the rendering portion of a page or you have to assign the display message to a page item which will maintain the value for when the next page is rendered.
Cheers,
Tyson Jouglet

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