Hi Edgar

See if the sys(11) is the problem.

SELECT Sys(11,Llamadas.fllamada) FROM Llamadas into cursor c_Test

To improve performance, I would

make sure I had ...

INDEX ON Sys(11,Llamadas.fllamada) TAG whateveryouwanttocallit

create new variables before running the query...

lnIni = sys(11,m.ini)
lnFin = sys(11,m.fin)

Then I'd change the where clause...

where 	Sys(11,Llamadas.fllamada) BETWEEN m.lnIni AND m.lnFin

HTH