I'm trying to make both triggers work but only the second one works.

At the beginning I had this formula and it worked fine:

Periodo := appointment('Check-In', 'Check-out')

After I added this formula:

and ('Allestimento anticipato' := appointment('Check-In', Evento.'Inizio montaggio ufficiale'))

and now this part works but not the first part

This is the complete formula:

Periodo := appointment('Check-In', 'Check-out') and ('Allestimento anticipato' := appointment('Check-In', Evento.'Inizio montaggio ufficiale'))

Can someone help me?