>If SET UDFPARMS is set to REFERENCE, then the change of the value of the sent variable will still be a fact, no matter whether you're using LPARA or PARA.
>
>It may be true that in your case passing is actually by value, but that is not 'known' to the routine. The routine is expected never to influence the sent variable, no matter what the setting of UDFPARMS is. So, I stick to my opinion.

From Help it's hard to figure out, if SET UDFPARMS affects object methods or not. It also doesn't say the scope of this setting. I wish Help would be more explicit.