I cannot create an assembly definition in my TFS 2013 project project because I get an error:

I participate in the project administrator group. I was added to the project assembly administrators group as a possible workaround, but still getting the same error.
The project team is not a group "Build Administrators", which is an obvious disadvantage for project-level Group to Link to the resolution for Team Foundation Server from MSDN.
- TFS 2013, TFS 2010. TFBuild. , TFS, .
Q1: , ?
, TFS TFSSecurity " " " ". , TFS , TFS.
Q2: , "Build Definition Authors and Builders", " " MSDN?
TFS, , .
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