Bernard (or whoever)

First let me say that when I clicked on RELY I got a BLANK entry screen, so I am unable to QUOTE. . .

The PARAMETERS() PARA3 = "A" looks strange to me. Perhaps something got lost in the HTML business that happens here, but just in case, take a look at that.

Seems to me that you are better off using PCOUNT() (as George T. has suggested.
In any case, you should verify that there are indeed 3 parameters *before* testing the third parameter for anything. Something like:

IF PCOUNT() > 2
test your content here
ELSE
set 3rd (and 4th) to default values)
ENDIF

This will solve the error message problem.

Good Luck,

Jim N