Empty Select on property of Database List linked with an integer property

Step to reproduce :

1- Create a new class : Sandbox.TestClass

• Add a new prop "codeNumber" : type Number
• Add a new prop "codeString" : type String
  2- Save and view the class
  3- Create the sheet and template of this class
  4- Create a new page with this class ( eg : codeNumber = 15 , codeString = 15)

5-Create a new class : Sandbox.DBListTestClass

• Add a new prop "dbListCodeNumber" type : Database List with followings :
  • Display Type : select
  • XWiki Class Name : Sandbox.TestClass.WebHome
  • Id Field Name : codeNumber
  • Value Field Name : codeNumber

• Add a new prop "dbListCodeString" type : Database List with followings :
  • Display Type : select
  • XWiki Class Name : Sandbox.TestClass.WebHome
  • Id Field Name : codeString
  • Value Field Name : codeString

6- Save and view the class
7- Create the sheet and template of this class
8- Create a new page with this class
Result :
==> you'll see that the select of codeNumber is empty