In our budget process, we do an initial import as part of the analysis process.  After generating reports and reviewing budgets, we copy the initial budget scenario into a different version and import a file of additions and changes.  When we try to validate this import to "update existing records", it doesn't recognize the Scenario ID.  This should be fixed, as a partial import could be dangerous. If it is determined that import errors affect items that were successfully imported, it would be difficult to find and reverse them.