Navigate to Send Notifications > Exemptions on Ports under PRF Directive > Validate Uploaded Exemptions.
The application will present the following search form: 

Fill in any of the search criteria and click on Search button. 
Provided that there are Exemptions which have been uploaded manually the application will present the list of these uploads in order to validate each one of them.

Select one of them and click the "Proceed with upload" button. 

If everything is fine the system will present the relevant success message. 
If on the other hand there is, for example, a Temporary Locode named TSTEX the system will present an error message similar to the following: