formula element variable requirement

Hey All,

I got a restriction on calmonth with a customer exit variable x for getting records for all calmoth <= x where x holds last months value .

Now, if I use an offset on x say (X-1) i.e calmonth restricted by <=last to last month

is it possible to get this value into a formula variable Y via customer exit or replacement path (Y should hold last to last months value)?

Regards,

Blasco