SRM MDM catalog

Hi,

In SRM MDM catalog,we have to approve the records(based on validations on fields) coming from Supplier say an excel file.I have a requirement that only the approved records shud be displayed in catalog whereas disapproved to b notified.So the question is shud the workflow run on import or after import?

n hw to see only approved items in DM and what abt disapproved items?where do they go?

Regards

Nisha