问题
I have recently upgraded an on-premises Team Foundation Server from Tfs 2015 to Tfs2015.Update3 (14.102.25423.0) The upgrade was completed and all other functionality seems to work as usual. A day or so ago I attempted to create a new Tfs project (TFVC) and that resulted in an error.
When I look at the application tier log files, I see the following:
[10:31:30.153] Executing step: Create the Team Project.
[10:31:30.167] Executing step: 'Create the Team Project.' WorkItemTracking.CreateTeamProject (4 of 13)
[10:31:30.183] Getting process template.
[10:31:31.463] Refreshing server caches.
[10:31:31.463] Importing work item link types.
[10:31:32.180] Importing work item types
[10:31:33.727] Importing work item types
[10:31:34.413] [Error] TF400930: Field 'System.ExternalLinkCount' is defined multiple times with different field definitions. Correct the field definition and try again.
[10:31:34.507] Microsoft.TeamFoundation.WorkItemTracking.Server.LegacyValidationException: TF400930: Field 'System.ExternalLinkCount' is defined multiple times with different field definitions. Correct the field definition and try again.
[10:31:34.507] at Microsoft.TeamFoundation.WorkItemTracking.Server.ProvisioningService.InternalImportWorkItemTypesOrGlobalWorkflows(IVssRequestContext requestContext, Int32 projectId, String methodologyName, IEnumerable`1 typeElements, ProvisioningActionType actionType, InternalSchemaType schemaType, Boolean overwrite, ProvisioningImportEventsCallback importEventCallback)
We are unfortunately making use of a customized template (which is based on the Scrum template) and it is exactly this template that causes the error. When creating a new Tfs project (TFVC) based on the standard Scrum or Agile templates it works fine.
I downloaded the customized scrum template in question and did a grep search on “System.ExternalLinkCount”. When I look at the fields they do seem to be of the same type. Any ideas or suggestion why it is acting up in this way?
回答1:
You can just remove the field definition from these work items, it's a standard field which will be added to all your work item types automatically.
来源：https://stackoverflow.com/questions/39352075/tfs-project-creation-results-in-error-tf400930-field-system-externallinkcount