Create a custom profile field (e.g. "Affiliation") with a shortname containing upper case letters (e.g. "eduPersonPrimaryAffiliation"). Create a custom profile field (e.g. "Address") with a shortname containing just lower case letters (e.g. "address"). Define a mapping at LDAP (or similar) auth plugin settings for these fields. Set update condition to "On every login". Log in via the mapped auth method as an existing user with a value for the mapped fields. Confirm that the profile fields have been set to the expected value. Note: It is important to test an existing user. Mapping will succeed on user creation even without the patch.