Path update on Feed import

I have an issue with my ulr being updated on Feed Importer update.

There are a number of feeds setup which add/edit node on the site and even though I have chosen the setting Update Action: Create a new alias. Leave the existing alias functioning. I need to update some of the url for SEO because information is not available in the feed files. When I update a URL in the node edit form, next time the feed importer runs it overwrites my changes and url I set is deleted.

I have check and the URL file is not updated on import.

On a side note I choose the update action: Do nothing. Leave the old alias intact, the URL was deleted completely

Is there any way round this?

Cheers,

Angela.