How to limit the possible values taken by an extenal parameter?

[Jean-Luc Plagnaud]

I would like to limit the choice of possible values taken by an external parameter.
I there a simple way to do than testing the allowed values and displaying an alert if it is different?

For instance, let's say that I have

extern int SL;

and I want that the only authorized values for SL are 10, 20 and 30.

How to do it?

Thanks

[Slava]

This feature is planned.

At present insert checking for possible values in the init function

[okwh]

After Start(){

////check SL

if ((SL!= 10) ||(SL!=20)||(SL!=30))

{

Alert("SL parameters error!");

return(0);

}