Thanks, Paul. That provides some interesting insights. Is that a python thing, as opposed to an Odoo thing? Is that why I couldn't find much about it in the Odoo documentation? Should I also assume that "formatLang" and "round" are just python functions? Does that mean you can use any python function inside a t-field call?

What I was really after in my question is a list of Odoo things that can be done in t-field or t-field-options.

That is correct the formatLang and round methods are python functions which are brought into the scope of the report through the qwebcontext dictionary which you can view as I advised.Regarding the t-field it is especially designed to receive odoo object properties and as for t-options they are a few preset options designed by Odoo to enhance the display experience even more For python expressions you might want to use t-esc and t-raw: more information on these here: http://odoo-80.readthedocs.org/en/latest/reference/qweb.html

I'm using PyCharm with Odoo9. I've used t-debug="pdb" inside the template. While report printing, there is no breakpoint hit, it just completes the report printing. Any ideas?

If you are on version 9 then you must add the --debug option when starting the server. There also should be a warning in the console if you've missed it. If that's not the case you should check that the t-debug is not within another t-if and the node is not reached.