For some record types, when multiple entries are allowed, you must designate one of the entries as primary. You do this by clicking the Option button next to the Plus button. When an entry is designated as primary, it is used in reporting and in any area where only one entry will be shown, no matter how many other entries exist.

In edit mode, the primary designation appears as a check mark in an option button. In view mode, however, the word "Primary" appears next to the primary entry instead.

Viewing a Primary Entry when in Read-only Mode