Disabling Principal Status of a Condition or Result
You can disable the principal status of a condition or result. In this case, the business analyst who modifies the decision table in the My webMethods Server repository can no longer assign a principal to a condition or result value of this column.
To disable principal status:
2. Right-click the respective column header and select 
Disable Principal from the context menu. 3. Save your changes to the decision table.