Diagnosis
The system could not produce a definitive check result using the
specified parameter/operator combination.

System Response
The system check configuration (DB17) may not be definitive for this
parameter.
For example: incorrect parameter configuration in Transaction DB17
Parameter: DIAGLEVEL
Operator: ==
Value for green: 3
Value for yellow: 4
Value for red: -
Current value for parameter 'DIAGLEVEL': 2
The result: The system check cannot determine an exact result (green,
yellow or red?).

Procedure
You should always ensure that values and operators are unambiguous.
In this example:
Knowing that the parameter 'DIAGLEVEL' can have values between 0 and 4inclusively, you should specify a list of values for red.
Value for green: 3
Value for yellow: 4
Values for red: 0;1;2