changes to syn checkboxes in new loan application

What changes i made is "Sync repayments with meeting" is mandatory to select "Sync disbursement date with meeting".
When "Sync disbursement date with meeting " checkbox is checked,  "Sync repayments with meeting"also checked.
When " Sync repayments with meeting" checkbox is unchecked , "Sync disbursement date with meeting" also unchecked.