[Plugin: ProjectManager] Unwanted form field in my Project

Hello everyone,

i created a project intended to make a team roster.
Here is the list of my Form fields :
[URL=https://img825.imageshack.us/i/projectmanager1.png/][IMG]https://img825.imageshack.us/img825/8101/projectmanager1.png[/IMG][/URL]

And how it is displayed in the Add Data screen :
[URL=https://img823.imageshack.us/i/projectmanager2.png/][IMG]https://img823.imageshack.us/img823/9813/projectmanager2.png[/IMG][/URL]

As you can see there is a form field named “code” that appears, but i didn’t create it and it bothers me since it appears at the beginning of each Data Set.
Any idea how i can remove it ? Does it come from a default setting i didn’t check ? or does it come from an interaction with LeagueManager plugin ??

Thanks for your help

Suzanne