If you search for "Yes" at any ticket page, you might well get all the expenses, in case all are paid, for instance. However, you're interested in an expense which contains "yes" as its description.
Exclude "Wage" and "Paid" fields from search fields on individual ticket pages.
Student is expected to send a patch for wikimedia-cz/tracker repository, hosted at Wikimedia Gerrit. When claiming task on GCI website, student should claim a respective Phabricator task as well.