Hi,
Check the following in J1ID :
1. Chapter ID has been maintained.
2. Whether material has been defined as Tools / Assets / Consumables against the plant in which you will be taking credit.
3. Check whether CENVAT determination has been maintained for that material - plant combination.
You are requested to check the same before taking credit of that material.
In order to avail 50% of credit (it should be taken in next fiscal year) you should execute transaction code J2I8.
Regards,
Tejas