NAV 2013 R2 - Why can't this URL field be longer than 20?

Hello,

I've created a new table and in this table there's a field called "Link", it's of type Text with a length of 50 and it's ExtendedDataType is set to URL.

When I try to insert anything above 20 characters I get the following error:


Is there some implicit restriction in NAV that doesn't allow more characters, or is there some property that I just can't seem to find that will allow more characters?

Best regards
Marcus