Era realizar algún cambio...desde que tienes la consulta...cambias por aquí ... por allá y lo hubieras logrado...
SELECT cast(day(t0.docdate) as nvarchar(2))+'/'+cast(month(t0.docdate) as nvarchar(2))+'/'+cast(year(t0.docdate) as nvarchar(4))+' '+ ((case when LEN(convert (varchar,t0.CreateTS,110))=5 then ('0'+ substring (convert (varchar,T0.CreateTS,110),1,1)) else substring (convert (varchar,T0.CreateTS,110),1,2) end) +':' + SUBSTRING(convert(varchar, T0.CreateTS,110),2,2) +':'+ SUBSTRING(convert(varchar, T0.CreateTS,110),4,2)) as Hora
FROM OPQT T0