I tested the next couple of functions at the command windows:

create cursor cur_Temporal (campo1 c(10))
alter table table cur_Temporal add column campo2 n(8,4)

There were no problems at all.

However, if try the same at the click event of a command button of a form, I get the error 1115 “Not a valid operation for a cursor object” (translated)

Could somebody tell me what makes the difference?

Thanks in advance

Oscar Corte