Error mobile no.

If you see this error it is due to the attempt of registering/changing a person with data that is already registered under an existing person. This is controlled for e-mail, mobile no. and social security no. (Therefore you are still able to find or register doubles if the aforementioned data is not present!)
This even controls your users login on your online booking.

The blocking of doubles with the same mobile no., social security no. or e-mail is enforced to avoid the same person/family to be present more than once in your database!