if there are negatives sum, otherwise show it, Sql Server

Language: Layout:

;with ledger as (
    select accountId, type, amount
    from (
        values
         (1, 'R', -10)
        ,(1, 'V', 10)
        ,(1, 'R', 30)
        ,(2, 'R', 20)
        ,(2, 'R', -5)
        ,(2, 'V', 5)
        ,(3, 'R', 20)
        ,(3, 'R', 30)
    )   x (accountId, type, amount)
)
,b as ( --identifies accountid, type with negatives
    select
        accountid
        ,type               
    from ledger
    group by accountid, type
    having min(amount) < 0
)
,onlyPositives as (
    select
         l.accountid
        ,l.type
        ,l.amount
    from ledger l
    left join b on b.accountid = l.accountid
                and b.type = l.type
    where b.accountid is null
)
,aggregatedNegatives as (
    select 
         l.accountid
        ,l.type
        ,amount = sum(l.amount)
    from ledger l
    inner join b on b.accountid = l.accountid
                and b.type = l.type 
    group by l.accountid, l.type
)
select  accountid, type, amount
from    onlyPositives

union all

select  accountid, type, amount
from    aggregatedNegatives

View schema
Execution time: 0,02 sec, rows selected: 6, rows affected: 0, absolute service time: 0,22 sec