>>>I already tried like that. The problem is when the parameter is not an array, like a character type, then when it come to the command myarray[1] <> "U" it gave me an error, myarray.prg doest not exist.
>>
>>It should be

IF <b>TYPE(</b>"myarray[1]") <> "U"

>
>Sergey,
>
>This is the syntax shown in my and Mark's messages, so it's not the problem.

Yes, but it's not what his message says.