All fee payers need to have a bursary number. These also need to match the bursary numbers you use in your accounting system. If you press the Missing bursary no button in the Finance Menu you will either get:

or if some fee payers don't have a bursary number, a version of the All pupils/adults form will come up showing only those pupils whose fee payers are missing the bursary number.

Click on the related adults button for each one to add the Bursary number to the adult record. Make sure you do not create duplicates with your existing busary numbers.