Symptoms: After importing content, the following warning is observed: Copy-from field is not set.
Resolution: You are receiving those warnings because there are duplicate entries present for the sub-controls in the xml file. Warnings are not going to affect any functionality. Importing this content into a new instance should occur without these ‘warnings’.
Scroll to the bottom of the import log and there should be a message stating whether the import was successful. If the import was successful then the data should have been updated successfully. If the import was not successful, then file a case with product support so they can investigate this as an issue.