There are multi-value LDAP fields, e.g. that contains the list of courses of a user. Currently OpenOlat only takes the first value and skips the other values.
Multi-value fields must be detected and mapped to the OpenOlat field. Since OpenOlat does not have multi-value user properties, the mapping is done by converting the LDAP multi-value field into a comma-separate single value user property in OpenOlat.