Specify a valid data import mode for master inspection characteristic &1

What causes this issue?

An unknown value was specified for the data import mode when importing
a master inspection characteristic into a task list.

System Response

The system does not recognise this unknown value.

How to fix this error?

Ensure that you only use the following values as data import mode
values:
'C' for no reference,
'L' for referenced master inspection characteristic, or
'N' to indicate that no data is to be imported for this characteristic.

Procedure for System Administrators

You can find additional information in the Include QP_CONST in
structure QPMK_IMPORT_MODUS.

Error message extract from SAP system. Copyright SAP SE.