For users of Importacular 3.4 patch 5 and below...
When going to the review screen you get multiple error messages as shown below:
Firstly: Exception in PopulateDefaultLookup: There was a problem with CreateRecordObject()
Followed by: Error in RunLookupPatternConstit. The lookup row returned without a value. Please report this error to Zeidman Development
Finally: Error in LookupMatchInGrid - the current lookup did not return a value. Please reportr this error to Zeidman Development.
You may get this multiple times while entering the review screen.
This has been fixed in v3.5. However there is a workaround if you are not able to upgrade immediately.
Ensure that the constituent id field is mapped. If you do not want to bring in or update the constituent id value then ensure that the field settings are set so that they do not update new or existing values.