Pricing Type G for material determination sub item in Billing

Dear All,

I am facing the pricing error while creating billing for material determination sub item with pricing type G in copy control from delivery to billing.

Kindly share your valuable suggestions.

Scenario:

Prices are changed from 1st April 2016.Sales Order created on 30.03.016. Delivery and PGI done on 05.04.2016.

Now when we are trying to create billing on 06.04.2016, we are getting pricing error as " Mandatory condition ZPR0 is missing"

For material determination , sub item is relevant for pricing and billing.

Condition Record:

ZPR0 - 1700 INR valid from 01.04.2015 to  31.03.2016

ZPR0 - 1900 INR valid from 01.04.2016 to 31.03.2017

                                    Sales Order                   Delivery          Billing  

Main Item Category    ZTAX                              ZTAX    

Sub Item Category     ZAPS(Price 1700)           ZAPS              ZAPS(Pricing Error)

With Regards

Azeez Mohammed