Default value for custom field

Jan 27 at 12:26 PM
I import a whole lot of documents into my SharePoint documentlibrary (this works great). Now I have one custom field which has get a default value. this value is the same for all documents.
I tried this:
        <ImportMapping xsi:type="ImportMapping_String"> 
This does not work. Already expected that but all I want to do is to have the field "CustomTest" to get the value "test" for all 1000+ documents.

What is the best way to achieve this?

Thanks for your help.
Jan 27 at 12:37 PM
Marked as answer by hacking_mike on 1/27/2017 at 4:37 AM