Letter of Enrolment

Hello po! Regarding sa Letter of Enrolment, do i still have to submit it sa registrar if I'm already planning for reimbursement (nasubmit ko na rin po sa DOST SEI yung receipt)? Nakalagay po kasi valid for first sem lang po and yung remaining balance ko po is not amounting 20k na. thank u so much po in advance!