Activate Add-On in ECC 6.0

1) Go to T-code SPRO.
2) Click On SAP Reference IMG button.
3) Check for Activate SAP ECC Extension
4) Select Business Function Set as SAP oil and Gas.
5) Change Status Of All the business function to ON.
6) Accept Prompt For License

SO Add-on Has been Activated...(Running in background)

Regards,
Gagan Deep Kaushal