A governing case is the set of process data values for a line or a tag that you select as the active case. If for a given line or a tag you create more than one case, Smart Instrumentation requires that you select a governing case. If you define a single case, the software automatically sets it as the governing case.
After setting a governing case, if you are working in As-Built or Projects, you should
not change the governing case. Changing the governing case in As-Built or Project
can result in data corruption.
Use this procedure to select a governing case for a line or a tag.
After you have enabled cases for line or a tag, if there is only one case, Smart Instrumentation automatically defines it as the governing case. If you subsequently enable additional
cases, the first case remains the governing case until you set a new governing case.
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Do one of the following:
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Open the process data sheet for an instrument tag from the Process Data module, Calculation module, or Domain Explorer.
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Open a process data sheet for a line.
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In the GENERAL section of the process data sheet, from the Case list, select the case that you want to be the governing case.
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On the Actions menu, select Set as Governing.
The Design Temperature and Design Pressure fields in the Additional Properties section of a process data sheet, are common to all cases associated with the data
sheet. Any action (data entry, editing, or deletion of data) in these fields is reflected
in all the cases, irrespective of which case the action was carried out on.