If your PI sheet contains fields that start with a question mark (?), the values in these fields need to be calculated by the system. You can start the calculation:
For individual values
For all values that need to be calculated in a PI sheet
See Calculating Values .
The calculated value will be displayed in the field. At the same time, a process message is created which will be used to report the value to process management when you start the corresponding function.
When you report the data for a processing step, all values calculated within this processing step are automatically recalculated. This ensures that if you change the values recorded in the PI sheet and these values are used in a calculation formula, the changes will be effective in the formula result.
Note
The formula used for a calculation can refer to one or more values entered or calculated previously on the PI sheet. For this reason, you should first maintain and calculate all preceding values before starting the calculation.
If a value is missing in a calculation formula, a corresponding error message is issued.