sql - looking for next day data - sql-server

Question

i have the below code which is working fine.
SELECT
pg.pgrpName1 [Santiye],
p.prsncode [Sicil No],
p.[prsnname1] [Adi],
p.[prsnname2] [Soyadi],
CLT.clntName1 [Firmasi],
fg3.grp3Name1 [Gorevi],
prf.pcntrName1 [Ekibi],
lnk11.lgrp11Name1 [Kaldigi Yer],
lnk12.lgrp12Name1 +' - '+lnk12.lgrp12Name2 [Kamp/Adres],
lnk13.lgrp13Name1 [Oda No],
cast(t.ioTransactionDate as date) as Tarih,
t.[iotransactiondate] [Giris Tarihi/Saati],
(SELECT
t2.[iotransactiondate]
FROM [Exen].[dbo].[IOTransaction] t2
WHERE ( t2.[iotransactiondate] = (SELECT Min(m.[ioTransactionDate])
FROM IOTransaction m
WHERE m.ioPrsnRefId = t2.ioPrsnRefId
AND Cast(m.[iotransactiondate] AS DATE)
= Cast
(
t2.[iotransactiondate] AS DATE)
GROUP BY m.ioPrsnRefId)
OR t2.[iotransactiondate] = (SELECT Max(m.[iotransactiondate])
FROM IOTransaction m
WHERE m.ioPrsnRefId = t2.ioPrsnRefId
AND Cast(m.[iotransactiondate] AS
DATE) =
Cast(
t2.[iotransactiondate] AS DATE)
GROUP BY m.ioPrsnRefId) )
and ioStatus = 1
and cast(t2.ioTransactionDate as date) = cast(t.ioTransactionDate as date)
and t.ioPrsnRefId = t2.ioPrsnRefId
GROUP BY
t2.[iotransactiondate]
)
AS [Cikis Tarihi/Saati],
prsnEText4 [Vardiya],
tz.tzoneName1 [GECE/GUNDUZ]
FROM [Exen].[dbo].[IOTransaction] t
LEFT JOIN dbo.person p
ON t.ioPrsnRefId = p.prsnRefId
LEFT JOIN dbo.PersonShift ps
ON ps.psPrsnRefId = p.prsnRefId
LEFT JOIN dbo.TimeZoneMess tz
ON tz.tzoneRefId = ps.psTzoneRefId
LEFT JOIN dbo.[PersonGroup] pg
ON pg.pgrpRefId = p.prsnPgrpRefId
LEFT JOIN FreeGroup3 fg3
ON fg3.grp3RefId = p.prsnGrp3RefId
left join Client CLT
ON CLT.clntRefId = P.prsnClntRefId
LEFT JOIN [ProfitCenter] prf
ON prf.pcntrRefId = p.prsnPcntrRefId
LEFT JOIN LinkedGroup11 lnk11
ON lnk11.lgrp11RefId = p.prsnLgrp11RefId
LEFT JOIN LinkedGroup12 lnk12
ON lnk12.lgrp12RefId = p.prsnLgrp12RefId
LEFT JOIN LinkedGroup13 lnk13
ON lnk13.lgrp13RefId = p.prsnLgrp13RefId
WHERE ( t.[iotransactiondate] = (SELECT Min(m.[ioTransactionDate])
FROM IOTransaction m
WHERE m.ioPrsnRefId = t.ioPrsnRefId
AND Cast(m.[iotransactiondate] AS DATE)
= Cast
(
t.[iotransactiondate] AS DATE)
GROUP BY m.ioPrsnRefId)
OR t.[iotransactiondate] = (SELECT Max(m.[iotransactiondate])
FROM IOTransaction m
WHERE m.ioPrsnRefId = t.ioPrsnRefId
AND Cast(m.[iotransactiondate] AS
DATE) =
Cast(
t.[iotransactiondate] AS DATE)
GROUP BY m.ioPrsnRefId) )
AND p.[prsnname1] IS NOT NULL
AND t.iotransactiondate >= '00:00:00 11.12.2016'
AND t.iotransactiondate <= '23:59:00 15.12.2016'
AND ps.psStartDate <= t.[iotransactiondate]
AND ps.psFinishDate > t.[iotransactiondate]
AND tz.tzoneRefId =5
and ioStatus = 0
GROUP BY pg.pgrpName1 ,
t.ioPrsnRefId,
prsncode,
prsnname1,
prsnname2,
t.[iotransactiondate],
t.iostatus,
tz.tzoneName1,
ps.psStartDate,
ps.psFinishDate,
prsnEText4,
fg3.grp3Name1,
CLT.clntName1,
prf.pcntrName1,
lgrp11Name1,
lgrp12Name1,
lgrp12Name2,
lgrp13Name1
but i need the next day data for [Cikis Tarihi/Saati] column , that's why i revised that part as
and cast(t2.ioTransactionDate as date) = cast(dateadd(day,1,t.ioTransactionDate) as date)
for example, when the column [Giris Tarihi/Saati] is 2016-12-12 , the data on the column [Cikis Tarihi/Saati] should be 2016-12-13
but it returns an error
Msg 512, Level 16, State 1, Line 1 Subquery returned more than 1
value. This is not permitted when the subquery follows =, !=, <, <= ,
, >= or when the subquery is used as an expression.
what am i doing wrong ?
any suggestions ?