Data is preassigned in the master inspection characteristic

What causes this issue?

You want to create a link to a class characteristic. To do this,
certain data has to be changed in the master inspection characteristic.
Which data must be changed depends on whether the class characteristic
is of the data type "<ZH>NUM</>" or "<ZH>CHAR</>."
If the class characteristic is of the data type "<ZH>NUM</>," the
following data is affected:
The master inspection characteristic is defined as a quantitative
characteristic. You can no longer change this setting.
For results confirmation, the "Summarized recording" indicator is set,
if the "Single value" indicator has been set in the class
characteristic.
For results confirmation, the "Single result" indicator is set, if the
"Multiple values" indicator has been set in the class characteristic.
All relevant data (for example, class width) is reset.
The "Check target value" indicator is canceled.
The tolerance key is canceled.
The "Confirm values" indicator is set and cannot be changed.
The number of digits is set to the value that is in the class
characteristic.
All limit pairs (except the specification limits) are reset.
If a unit of measurement was defined for the class characteristic, it
is copied into the master inspection characteristic and it can no
longer be changed.
If the "Required entry" indicator is set for the class characterstic,
the master inspection characteristic becomes a required characteristic;
otherwise it is an optional characteristic.
The master inspection characteristic is marked as a reference
characteristic, this means that if this characteristic is included in a
task list or material specification, it first appears as a reference.
To cancel the reference, the characteristic must be manually unlocked.
If the class characteristic is of the data type "<ZH>CHAR</>," the
following data is affected:
The master inspection characteristic is defined as a qualitative
characteristic. You cannot change this setting.
For results confirmation, the "Summarized recording" indicator is set.
You should not change this setting when the link has been created to
perform batch classification.
The "Characteristic attribute" indicator is set and cannot be changed.
The selected set from catalog type 1 contained in the class
characteristic is assigned to the master inspection characteristic. You
cannot change this selected set.
If any method-dependent selected sets from catalog type 1 are assigned
to the master inspection characteristic, they are canceled.
If the "Required entry" indicator is set for the class characterstic,
the master inspection characteristic becomes a required characteristic;
otherwise it is an optional characteristic.
The master inspection characteristic is marked as a reference
characteristic, this means that if this characteristic is included in a
task list or material specification, it first appears as a reference.
To cancel the reference, the characteristic must be manually unlocked.

System Response

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

How to fix this error?

Ignore the warning or check the settings in the master inspection
characteristic.

Error message extract from SAP system. Copyright SAP SE.