Issue in loading the Maintenance asset

Summary

Multiple external addresses exist with the provided values. You must provide a unique combination

Content

Dear All,

I am trying to upload the assets into oracle and when i am selecting the location type as 'External Location' in the FBDI, it is giving the below error.
"Multiple external addresses exist with the provided values. You must provide a unique combination".
I need to associate the customer and also a location to the asset which i am importing but the issue is coming with 'External address' and i am also giving the location name in the FBDI which is giving the above error in import.