It is best practice before migration to use the Save and Check function as well as the Schematic Checker feature in DxDesigner (pre-iCDB) in order to ensure that all WIR files are up to date and generated. However if the pre-iCDB version is unavailable it is still possible to run the check function without the older version of DxDesigner. Instructions on how to use dos to run this feature can be found in TechNote MG546290.
I would suggest watching the video found in TechNote MG578638 which goes over the best practices of converting a pre-iCDB project to current versions of DxDesigner.
If you are still encountering issues please open a service request on SupportNet so we may be able to look deeper into this issue