I am having issues with this database that I have designed and maybe someone can point me in the right direction. I have a main table "tblRentalDetails" and a table ""tbllicenseDriver". In the main form "frmNAVIGATIONFORM" I want to have more than one license drive per specific car rental contract. I am getting errors 'You Cannot Add Or Change A Record Because A Related Record Is Required In Table...'. I have watched hours of You Tube videos and have spent hours on experimenting on this but am no closer to a simple solution. In fact I am further away that ever it seems. I just want to start with maintaining the data with a BookingNumber and then go from there. Can anyone take a look at my database and see what I might do to fix this. I have attached the database. Very much appreciated in advance.