The sinking fund contribution should be based on a long term financial plan. Management companies should have a rolling 10 year plan, and base the sinking fund contribution on this, rather than some random figure like E200. We were almost bankrupt a few years back due to 6 lifts needing to be replaced within 2 years at E35k each plus other big capital expenditure items. It nearly drove us under but luckily we came through it. Forward planning would have avoided the nightmare we had to deal with.
It's relatively easy to predict what the big items are, and when they will fall due for replacing. A long term plan doesnt have to be elaborate and it doesnt have to be exact, and you dont have to commit to doing the work exactly when planned, but it allows companies to have an adequate sinking fund that can be justified if questioned.