Diagnosis
The process instruction &V4& is of type "process data request".
Characteristic PPPI_EXTENAL_VALUE specifies that a variable is tobe used to assign a value to the pertaining message characteristic. Youmust define the corresponding variable directly in front of thischaracteristic using characteristic PPPI_DEFAULT_VARIABLE.
However, the variable has not been defined at this point in the processinstruction.

Procedure
RESET N1
Assign characteristic PPPI_DEFAULT_VARIABLE to the processinstruction immediately before characterisic PPPI_EXTERNAL_VALUE.
Assign the name of the required variable to characteristicPPPI_DEFAULT_VARIABLE.