I created a custom report application and am trying to view the output / report it produces in PDF format via Portal.

I can view the report fine in text format, but when I try to view the report in PDF I get the following error:

Error: No .dtl file was found.

I then went and checked to ensure that I could view the regular Lawson reports in PDF via Portal, and they are all ok.

Therefore, there must be something wrong somewhere with my new custom app.

Any ideas?

If your "new custom app" is a 4GL COBOL-based program, which I can't tell if it is or isn't, then looking up information on the file "rpt.cfg" in Lawson's KnowledgeBase will tell you a lot. Settings on the report configuration file(s) determine how a report or reports are generated.

(If you're working with another language or system, could you specify more precisely what you're doing?)

yes it is cobol, I will look at the rpt.cfg