What is the difference between a 'warning' and an 'error'?
The validator has been updated to allow NPI type mismatches to not cause a full file validation failure, and as such any NPIs that validate as the correct type match (as per NPPES data) will be imported.
Any NPIs that do not match NPPES, or are nulls and thus cannot be matched, will generate "warnings" and not be imported. The rest of the file (the portions that do not generate warnings) would be imported.
An error is a validation error that will cause the file to fail validation.