Forum for users that want to write their own custom queries against the PT database either via the Structured Query Language (SQL) or using the PT3 custom stats/reports interface.
You do need to have the Value Expression laid out correctly, including whitespace, but when you make changes the HUD will need to be reloaded to use the changes, so you may not find the fix works until you restart.
No, that link doesn't say anything about tooltip formatting - you said you were asking about reports. That link explains how to add times/opportunity formatting to stats for reports or the HUD. You can't change the formatting of the tooltip.