Diagnosis
Characteristic &V1& has been assigned to characteristic &V2& in theprocess instruction and is thus marked as an output value.
The following characteristic values can be displayed in the PI sheet:

• In process data requests, the default values of those message
characteristics that are marked as input values in the processinstruction

• In process data requests and calculation formulas, the values of all
other message characteristics assigned to the process instruction
However, characteristic &V1& has not been assigned as a messagecharacteristic to the process instruction or has been defined as aninput value without a default value.
For this reason, no value can be displayed for characteristic &V1&.

Procedure
If characteristic &V1& is to be contained in the processmessage:


• Assign characteristic &V1& as a message characteristic to the process
instruction.

• For input values, also define the default value you want to display.

For more detailed information on how to assign message characteristicsand default values to a process instruction, see Extended Help.
If characteristic &V1& is not to be contained in the processmessage:

• Check whether you can use a variable to insert the desired value from a
preceding process instruction.

• Define the variable as an output value if required.

To do so, use characteristic PPPI_OUTPUT_VARIABLE instead ofcharacteristic &V2&.