Diagnosis
The process instruction is of type "process data calculationformula".
In a calculation formula, you must define a text (characteristicPPPI_INPUT_REQUEST) before the value to be calculated (characteristicV2). this text is displayed in the pi sheet in front of thecalculation result.
However, this text has not been defined before characteristicV1 v2 in the process instruction.

Procedure
RESET N1
Assign characteristic PPPI_INPUT_REQUEST to the process instructionbefore characteristic &V1& &V2&.
Assign the required text to characteristic PPPI_INPUT_REQUEST.