Generally, there is no limitation on what you can put in your logbook, there is a limitation on how many block hours and duty hours you are legal to fly.
this depends on the the local CAA, so have a look in your operations manual.
Nothing stopping you logging what you fly, as far as legality is concerned, this will probably come out anyway if you have an accident within the next 5 years.
With regards to getting a different job one day, you may want to omit the hours flown over the legal limit (according to the ops manual).