How to access custom nodes in sap reference using sm30

Hallo Experts,

I was able to successfully add a activities under the node in SAP reference IMG. (using transaction S_IMG_EXTENSION).

However, when I execute transaction SM30, enter the name of the custom table and hit the button customizing, it does not take me to the appropriate node in IMG.

can somebody tells me what steps am I missing?

I will really appreciate any help you can provide.

Thanks

waseem