Model Annex81 vs Profile Annex81: identifier cardinality and MS does not fit

[bdc-ehealth]

@SmalsJulien @NathanPeeters

The cardinality of the identifier and MS indication differ between the logical model and the profile.

Please advise!

[bdc-ehealth]

see #400

[NathanPeeters]

The identifier will be created by Uhmep (no info about identifier in the payload, and then identifier is created at reception in UHMEP system). => 0..* (because we have also a shortcode)
In the logicalmodel of annex81, referralid is mandatory and shortcode optional, so here it is 0..* because integrators don't create the id and shortcode themselves (uhmep creates it at reception).