Input parameter &1 not filled with value for check instance &2

What causes this issue?

The data source type for the check instance has been assigned input
parameter &V1&. This input parameter is marked as "requiring fixed value
at configuration time" (PYD_TYPTI_FIXED_IND field) in the Customizing
activity <DS:SIMG.PYD_FRW_1>Define Data Source Types</>.
However, value of this input parameter is not defined.

System Response

The system reads the input parameter attributes of the data source type
of the data source instance.
The system finds that an input parameter type is marked as Fixed
(meaning requiring a fixed value at configuration time).
The system looks for the same input parameter for the data source
instance in the Customizing activity
<DS:SIMG.PYD_FRW_3>Define Data Source Instances</>.
The system finds the input parameter type assigned to the data source
instance, but does not find the selection value for this parameter type.
So the system throws this message.

How to fix this error?

RESET N1
In the Customizing activity
<DS:SIMG.PYD_FRW_3>Define Data Source Instances</>, note down the data
source type for the data source instance.
In the Customizing activity
<DS:SIMG.PYD_FRW_1>Define Data Source Types</> <LS>-> Define Data
Source Types</>, find out for the data source type which input
parameters are marked as Fixed and Mandatory.
In the Customizing activity
<DS:SIMG.PYD_FRW_3>Define Data Source Instances</>, add the same input
parameters of Step 2 to the data source instance and specify the
Selection Value for these parameters.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.