how to remove duplicate row null value in pivot

select distinct * from (select
distinct A.AGENTID as Agent_ID
,T.AGENTBRANCHCODE as Agent_BranchCode
,B.companyname as CompanyName
,sum(T.TRANSACTIONAMOUNT) as Amount
,(sum(T.TRANSACTIONAMOUNT) -sum(T.AGENTAMOUNT)) As commisionRate

from TBL_TRANSACTION T
left outer join TBL_BILLER B
on T.BILLERID=B.BILLERID
left outer join TBL_AGENT_BRANCH AB
on t.AGENTBRANCHCODE=AB.AGENTBRANCHCODE
left outer join TBL_AGENT A
on T.AGENTCODE=A.AGENTCODE
where convert (varchar,cast(T.TRANSACTIONDATETIME as date)) between '2017-03-27' and '2017-04-27'
group by A.AGENTID,T.AGENTBRANCHCODE, B.companyname
)src
PIVOT
(
sum(Amount) For CompanyName IN
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