Net.data START_ROW_NUM with SELECT WHERE clause

I'm trying to implement PREVIOUS|NEXT processing for search results when
particular selection criteria return a large result set.  I used the example
in the "Net.Data Reference" manual under START_ROW_NUM; pretty much the only
difference is the SELECT (I use a WHERE and an ORDER BY) and how I format
the results.  The code for handling the PREVIOUS|NEXT processing was
copied/pasted.

The results are limited to RPT_MAX_ROWS as expected, and the NEXT href is
formed correctly, however, when clicked, the result is not the next set of
records, but the 1st set.

Any ideas what I'm doing wrong?  I'm on V4R5 using the classic HTTP server.
I can post code if that would help find the problem.

tia,
Peter Dow
Dow Software Services, Inc.
909 793-9050 voice
909 522-3214 cellular
909 793-4480 fax