Dear Vamsi,
I think you can omit some parts of rules. It's interesting why without LEAVE option your rule won't pick up!
You can do it by a PCR and a rule in V_T559L also.Simply control the last day of last month and put the remain quota into a time type as you have it in PCR: LV1 9T01
Then put the same time type in V_T559L in a quota generation rule. With this method you won't need second rule.
By the way, how you are generating your quota? If you are generating it in a daily base I have one more point.
As I see in PCR: LV1 your controlling the last day and maybe you have put it before CUMBT and QUOTA function as Siva recommended.
ACTIO :LV1 Carry forward
CUMBT
QUOTA
P2006 :ZV2 Update QT
In this case you are calculating the remain of your quota before system gives quota of last day(31.12.XXXX). If this is the case for you please careful will lose quota for 1 day.
Regards,
Omid