APO Resource in Work center capacity

Hi,

This question is about the icon "APO Resource" in capacity header of a work center in ECC. The documentation says "You can maintain additional data for APO resources in the SAP ECC work center directly (press the “APO Resource” pushbutton in the work center capacity header)."

We are in ECC 6.0. My issue is I don't see this icon any where in work center (CR03).

Where can I find this icon in ECC 6.0?

Thanks a lot.