* Expects operating profit at 4.85-4.90 euros/shr vs 4.92

* Has issued a 230 mln euro convertible bond for investments

* Expects interest charges to rise in Q4 due to bond issue

* Nine months operating profit up 6 pct to 85.8 mln euros

(Adds details)

AMSTERDAM, Nov 10 (Reuters) - Dutch property group Wereldhave NV (WEHA.AS: Quote, Profile, Research) said on Tuesday it expects full-year operating profit to fall slightly from 2008 on higher costs, as it issued a convertible bond to make acquisitions.

Wereldhave, the Netherlands' third-largest listed property fund, expects its full year operating profit -- rental income minus expenses -- to be between 4.85 and 4.90 euros per share compared to 4.92 euros last year, it said in a statement.

Lower rents in Finland, higher interest costs due to the issue of a 230 million euro convertible bond, maintenance costs, and a weaker dollar will weigh on results in the fourth quarter and full year, the company said.

Wereldhave, which manages 2.5 billion euros in U.S. and European property, said it issued the convertible bond to "take advantage of attractive investment opportunities". Due to the issue, it has 350 million euros of immediately available funds.