The recommended workflow when preparing for an overmolding analysis, is to assign 1st shot or 2nd shot to the relevant model elements, on the Overmolding Component tab of the relevant property dialog.
Historically, it has been possible to prepare for an overmolding analysis using the tetrahedral element type Overmolding second component (3D) for the part and Hot runner for overmolding second component (3D) for hot runners. Both this method, and the recommended workflow, have been supported for several years, but this has created the potential for confusion.
The historical method for preparing for an overmolding analysis is being obsoleted. To prepare for this, the Overmolding second component (3D) property has been renamed Legacy overmolding second component (3D) : obsolete, and the Hot runner for overmolding second component (3D) property has been renamed Legacy hot runner for overmolding second component (3D) : obsolete. You will see this change for any study from a previous release that is opened in this release, and that was prepared for overmolding using these property types.
The 2015 release will support these legacy property types, and the analysis will run, with warnings. However, if your model uses these legacy property types, we recommend that you change them to Part (3D) or Hot runner (3D) as appropriate. Support for these legacy element property types is not expected beyond this release.