> VALOR_OUT = ROUND(VALOR_OUT, 2); -- **** Here is the error. if i
> comment
> this line every thing works fine
> suspend;
> end
>

What is this ROUND function you are using? It must be some UDF.

Is it declared properly?
Is it threadsafe?
Have you made sure that VALOR_OUT is not null?
Have you configured the UDF path in Firebird.conf?
Have you restarted firebird since making any change to this path

Are you able to use it in a simple query such as select ROUND(1.5, 1)
from RDB$DATABASE; ?

Adam