Problema Con con funcion Date

[jmiguel85]

Select Sum(cli_num), datename(month,cli_fec) + ' ' + datename(Year,cli_fec) From CLIENTE
group by datename(month,cli_fec) + ' ' + datename(Year,cli_fec),datepart(month,cli_fec) + datepart(year,cli_fec)
order by datepart(month,cli_fec) + datepart(year,cli_fec)

Intenta con esto. Me dices que tal.