Billing creation Tax condition need to reclaculate and split should not happen

Hi Experts,

At the time Biling creation VF01 need to calculate tax based on the given date,so i did the changes in the exit  USEREXIT_PRICING_PREPARE_TKOMK -> RV60AFZZ ->  -> SAPLV60A

I have modified TKOMK-FBUDA field with my new date so system is doing calculation as per the excepted but order is splitting with more than one invoice and split analysis not giving any clues.

code is as below

tkomk-fbuda = lv_tpd "New tax point date

Can you guide me any other workaround i need to changes anything so it will not split.

Tnx in Advance.

Regards

Ajay