Can U Help Me Debugging This I Appreciate Ty

select
acr_application.appNo as 'applicationNo',
acr_application.facilityName as 'nameOf DrugTesting',
acr_application.adr as 'address',
acr_reference_no.refNo as 'referenceNo',
ref_charge.chargeDesc as 'charges/fee',
acr_reference_no.amount as 'amount',

ref_settings.earlyFileDiscnt as 'pdiscount',
((ref_settings.earlyFileDiscnt / 100) * acr_reference_no.amount) as 'discount',

case when acr_reference_no.earlyFileDiscntDt is not null then acr_reference_no.earlyFileDiscntDt
else
case when '2007-09-29' <= ref_facility.validToDt then date_sub(ref_facility.validToDt, interval (ref_settings.earlyFileDiscntValid + 1) day)
end
end as 'discountValidity',

ref_settings.lateFileDiscnt as 'psurcharge',
((ref_settings.lateFileDiscnt / 100) * acr_reference_no.amount) as 'surcharge',

case when acr_reference_no.lateFileSurchargeDt is not null then acr_reference_no.lateFileSurchargeDt
else
case when '2007-09-29' <= ref_facility.validToDt then ref_facility.validToDt, select a.validTodt from acr_application a where a.appNo = (select max(b.appNo) from acr_application b where b.appNo < acr_application.appNo)
end
end
end as 'surchargeValidity',

'0012 2222 20' as 'accountNumber',
concat('DOH-',acr_reference_no.refNo, '','-85619') as 'accountName',

concat(if(acr_application.ownerTitle is null or acr_application.ownerTitle='','', concat(acr_application.ownerTitle, '')),
acr_application.ownerFname, ' ',
if(acr_application.ownerMname is null or acr_application.ownerMname='','', concat(substr(acr_application.ownerMname,1,1),'.', ' ')),
acr_application.ownerLname, '', '',
if(acr_application.ownerSuffix is null or acr_application.ownerSuffix='','', concat(' ', acr_application.ownerSuffix))) as 'nameOfRepresentative'

case when acr_application.appType = 'INA' then acr_reference_no.amount
else
case when acr_application.appType = 'RNW' then
(if(acr_reference_no.earlyFileDiscnt is not null
and acr_reference_no.earlyFileDiscnt <='2007-09-29',
acr_reference_no.amount + (acr_reference_no.amount * (ref_settings.earlyFileDiscnt / 100))))
else
case when acr_reference_no.earlyFileDiscntDt is not null
and acr_reference.earlyFileDiscntDt > '2007-09-29'
and '2007-09-29' <= ref_facility.validToFt
then acr_reference_no.amount, acr_reference_no.amount + (acr_reference_no.amount * (ref_settings.earlyFileDiscnt / 100))
end
end
end as 'totalCashDeposit',

case when acr_application.appType = 'INA' then date_add(acr_applicationappDt, interval ref_settings.validityAfterAppDayy)
else
case when acr_application.appType = 'RNW' then acr_reference_no.earlyFileDiscntDt
else
case when acr_reference_no.earlyFileDiscntDt is not null and acr_reference_no.earlyFileDiscntDt > '2007-09-29' and '2007-09-29' <= ref_facility.validToDt then ref_facility.validToDt, date_add(ref_facility.validToDt, interval ref_settings.validityAfterAppDay)
end
end
end as 'bankValidity'



from acr_application
left join ref_facility on acr_application.appNo = ref_facility.appNo
left join ref_settings on ref_settings.service = acr_application.service and
ref_settings.ownType = acr_application.ownType and
ref_settings.facilityType = acr_application.facilityType and
ref_settings.institutChar = acr_application.institutChar
left join (acr_reference_no left join ref_charge on acr_reference_no.chargeId = ref_charge.chargeId and acr_reference_no.paid <> 'Y')
on acr_application.appNo = acr_reference_no.appNo