Multiple URL attributes?

Maybe I expressed myself poorly.
Suppose:

  1. I add ‘a’ URL attribute - then fill it with e.g. a link to a Devonthink item
  2. but then, I also want to add a ‘2nd’ URL attribute, this time it will contain a link to e.g. Evernote
    As you can see from my screenshot, the 2nd time the URL-attribute is not available anymore…

=> I can’t select the URL attribute for a second time…

Do you mean that I need to e.g. create my own URL attribute and name it DTPO-URL and EVERNOTE-URL? OR?