Bug Work Item Customization Error

After the customization of the bug work item I'm getting the following error on each check in with an associated bug work item:

“Failed to update the following work item:
ID 58: Reason: TF26201: This work item has unsupported fields, or user does not have permissions.”

I added 3 new fields with Process Template Editor tool:

Name: Steps to Reproduce;
Type: Plain Text;
Ref Name: Primavera.VSTS.SC.StepsReproduce;

Name: Observed Behaviour;
Type: Plain Text;
Ref Name: Primavera.VSTS.SC.ObservedBehaviour;

Name: Expected Behaviour;
Type: Plain Text;
Ref Name: Primavera.VSTS.SC.ExpectedBehaviour;

Rule (for the 3 new fields):
Required for [Global]\Team Foundation Valid Users

All the data on new fields is saved. I am a member of group “Team Foundation Administrators”. I’m missing something?

Thanks.

[1431 byte] By [PatricioFernandes] at [2007-12-19]