That was an expensive poster then.
But normally, peeing on the wall plus tearing a poster is a "run 'em off the premises" thing. If a cop happens to see it, or be near enough to respond ... yeah, you can hit 'em up with some minor-ish charges**. And, yeah, it's not the U.S., and the same "ground rules" -- both codified law and cultural traditions -- will be different. Dunno though ... starting to feel like a huge molehill was built on not much. From what I know for sure, which ain't much.
** and, yeah, I know public urination these days can lead to sex-offender status in some jurisdictions.