Datum Feature Label has Syntax Errors (ISO)
The datum feature label has syntax errors and cannot be processed. The value of a datum feature label must meet the following criteria:
• May contain only capital letters (no numbers or special characters)
• May contain any number of characters
• May not include I, O, Q, or X
You can fix this problem in one of the following ways:
Using GD&T Advisor functionality…
1. Right-click the feature icon in the Feature Tree that the datum is associated with and select Edit Definition from the context menu.
2. On the Tolerance Feature dashboard, specify a valid datum feature label.
3. Select 
in the dashboard to accept the changes.
in the dashboard to accept the changes.