6.1.12. Validity Check of the Selection Entries 
To guarantee smooth sequencing of both the selection processing and
the output, AMO SELG – which processes and updates the selection
tables – carries out a validity check on the changed selection
entries, especially the output indication.
A selection group is only released for operation if the result of
the validity check is positive or, in certain cases, if it can be corrected.
Wrong, incomplete, or invalid entries always lead to an error message,
even when corrected.