You may encounter compatibility issues when importing model assemblies that you saved in a previous version of the application. To address this, you can first update the legacy system to your current version using the following steps:
From Workbench
To update your systems to the current version: right-click on the Model cell of the upstream system and select . The application automatically saves the project and as a result, updates the systems to the current version of the software.
From Mechanical
In the event you open a legacy system in Mechanical and are prompted with a warning message regarding the version, you can:
Make a minor change that does not affect the solution states (hide a body and unhide it again, change the name of an object, etc.).
Save the Mechanical database or close the application. The systems are updates to the newer version.