The address field in CRM is 100 characters long. The address you want to import from Direct+ is 125 characters long.
To import it in the desired way in CRM, you can crop the length of the input string (Direct+) through mapping.
Applies to all maps for that field
The rule you set up applies to all mappings in that specific field. When you apply above mentioned example, this means that every address you import is cropped to 100 characters.