...a single-group group function)
select '01 Arrears' as arrears,a.agreement_type as Agreement_type,a.agreement_status as agreement_status ,count(*) as count,a.prb_number as prb_number,a.prb_fund_type as fund_type,
sum(a.wkprem * ((to_date(sysdate,'dd/MM/yy') -...