If i service the bike myself can i enter a new service date or is this main dealer only

When you go to sell your bike again peeps would prefer to see a dealer mark as most dont trust someone else doing it them selfs and it wouldnt hold up should something go wrong best to have the mark for resale take it to the garage tell them you did a bit on it then ask if they could look it over may cost a bob but would be worth it best of luck