Hello Mike, thanks for your answer.

The last thing I tried is adding a string variable called "Edificio"
(building) as a parameter. What I try to do is reach the unit variable value
from within the procedure, but it's as if there's a wall and I can't get to
it. If I assign the value from within the procedure, it works ok. If I try
to add the variable to the parameter list in the procedure, first it tells
me that the previous declaration doesn't match, and when I edit the
procedure declaration to make it match, it says it doesn't match with
something else, as if the parameters for this procedure are a fixed format,
and can't be adapted to this circumstance.

If you can, please answer on my 14/08/99 message. Thanks for your help.