Getting a good grasp of Aware IM’s Reference Attributes is fundamental to matering Aware IM. They are industry unique and unbelievably powerful.
However, like any immense power, it can be dangerous in the wrong hands.
The screenshot included here is a ready reckoner for what types of References are valid and how they can be associated with their matching attribute in the connected Business Object.
You will notice I have used a particular prefix naming convention. I recommend using that ALWAYS and it will save you an enormous amount of heartache down the track.
I will write up a blog shortly to explain why.