This is the name of your reusable part that will pop up when the user mouses over an instance list entry of this business object.
The reusable part must have as its ancestor VF_AC021 in VLF-WIN and VF_AC021O in VLF-ONE.
In order for the pop up to be shown, the business object that displays the instance list must have the Enable Pop Up Panels check box checked, and the end-user must not have disabled instance list pop ups. The pop up panel can be any size you want.
In VLF-WIN this feature is only available for the primary instance list, for Frameworks being run in DirectX mode (Render mode M).
This property is in the Business Object Instance List tab.