DP95 & RRB billing

Dear friends,

Will doing "DP95" transaction it is not creating any billing request. Can anyone guide me what are the configuration required for DP95 and RRB billing. And please explain the process flow.

Itu2019s related to service oriented; now we are following steps as

VA01 -CAT2 -CATA -DP90 -VA02---VF01.

In our scenario we are not using project systems (CJ20N)

But now we want to change the process instead of u201CDP90u201D transaction to bypass this process we want to do u201CDP95u201D transaction.

u201CVA01 >CAT2 (Maintain time sheet) >CATA >DP95 >RRB billing.

Regards,

Bhanu