>Hi Sergey,
>
>It is true, as always the documentation puts the hands ahead.
>
>No reference is made variable and property, or ref/value parms pass mode.
>
>I can uses function(@var).
>
>What means "supposedly forbidden manipulation" ??? for one argument of the philosophy, very many, but for a developer, nothing!
>
>Any bug it can be "supposedly forbidden manipulation".
>
>They had to write :
> "on SELECT-SQL command any variable or property is supposed costant, and UDF is supposed determinist" ( see MSQL )

Hi Fabio,

It would be very good if VFP help was as good as MS SQL Server Books Online but it isn't. In many cases you've to exercise your own judgment on what is intended use of some of VFP features and what is not. IMO, UDF's should not have side efefcts, like altering variables outside of there body. It get even worse with UDF in selects because ther's no guaranty how many times UDF can be called and at what point in SQL processing.