invalid expression in the select ....

[samantha jones]

solo por curiosidad

tampoco funciona asi?

select c.key_cab_fac, sum(Select (t2.total)
From form_pago t2
Where t2.key_cab_fac=t1.key_cab_fac
And t2.cod_pago=101) as cheq
From cab_fac c , form_pago t1
Where c.estado='T'
And c.key_cab_fac=t1.key_cab_fac
Group by c.key_cab_fac

Saludos