cenvat credit of additional duty of customs

As per importer price of 10 units

Basic 100

Excise 10

Ecess 2

Shecess 1

AED 4.52

We bought 5 units from him we treat it as a case where tax code inclusive of all duties where a backward calculation is used in conditions in Purchase order.

problem is that we are purchasing a capital item.

duties cenvat crdit available for different duties other than AED is 50 this year and 50 % next year. For AED 100 % cenvar redit should be available but that is not happening.

what I saw in one of SAP notes is to make a MM condition ZADC and activate AED in tax code but that doest not help to get AED credit avilable 100 %.

other SAP note 943767 tells a different steps for ADC.

what should we do in this case i.e what all sap notes should be checked for in system so that we can get 100 cenvat credit of AED passed on by first stage dealer of Imported goods in india using a backward calculation situation.