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My program runs fine except when I've tried to tack on 31 data months to beginning of data. Results are now all ok except for the end, which does not pick up the last data. Have tried playing with proc options, sample size, and resturucture/append. I'm obviously missing something even though the wf file has been all extended properly and there are no error messages. Any suggestions appreciated.
thanks.

You're going to have be a bit more precise. It is pretty difficult to tell what the problem is, and what you have already done that might have caused the problem.

my original sample range is @first @first+569
workfile structure monthly 1962:08 to 2011:12
With this I get an output graph that correctly shows a "bump" in 2009.

My new sample range is
@first @first+600
new workfile structure is 1960:01 to 2011m12
with this I get the same correct output but starting with 1960:01

The problem is that there is no "bump" shown for 2009. So it appears there's a cutoff (it flatlines) 31 units from the end.
All of the data are extended accordingly and the program shows no error messages. I believe I've used Proc append/resturcture command properly.

I use the same program for both runs, only have
it recognize a longer length with the instruction !length=@rows(seriesname) with all basic data extended and filled in.

Any suggestions, hints, appreciate as to what might be the cause or how to fix.
I can also forward the two graphs which illustrate this at a glance if needed.
thanks.

Again without knowing how you have used a command, it is difficult to judge what you have done wrong.