You misunderstood. It means: sabbatical year (irony)... I used overtime (200) and 1 week of vacation for it
An ironic smiley was not present.
Well, surely you accounted for your overtime hours and vacation week, the hours you worked after regular working hours. Fairly, one should add that as personal contribution to the house price, meaning: add it! I believe one charges about €20/hour for that.