Deactivation of Deferred Tax transfer functionality RFSUMV50

Hi Experts,

We are on ECC6-EHP4, in our system deferred tax tansfer program is already activated for last 2 years. But as it is not posisble to post the "Residual Payment" when this program is activated, we are facing problem in clearing our customers. Secondly as per new service tax rules as well, now in India, Deferred (service )tax has to be paid on "Accrual Basis" unlike payment basis as earlier. With this changed business scenario can I deactivate the functionality of deferred tax transfer and if yes, what care should I take.

Please advise

Thanks

Shailesh