It is possible that you might have included the property “com.denodo.vdb.admin.gui.sourcerefresh.overrideFieldInfo=true” in the configuration file located under the path “<DENODO_HOME>\conf\vdp-admin\VDBAdminConfiguration.properties”, which could be the cause of this issue.
I performed the following steps in my system and was able to successfully retain the field descriptions created in base views. Therefore, I recommend you to perform the same steps at your end as well.
1. Navigate to the path <DENODO_HOME>\conf\vdp-admin\
2. Open the file VDBAdminConfiguration.properties
3. Update/Set the property
4. Restart the Virtual DataPort Administration Tool
5. Perform Source Refresh again
Hope this helps!