A checkmark in this field indicates that the replication counter is updated according to the value
in the Repl. Counter Interval field. If the field that the replication counter is working on has no "missing values" in
the order of numbers you do not have to checkmark this field. However, you might consider using it if you have a value in the Repl.
Counter Interval field.
Example
You are replicating table A, the Repl. Counter Interval for the relevant scheduler subjob
is 1000. In the first iteration of replicating the job you replicate entries with the value
0 to 1000 in the field that the replication counter works on. In the next iteration there are no entries with the value from 1000 to 2000.
If you have not checkmarked the Upd. Counter on Empty Interval field for the subjob the replicator
will try to replicate from entry 1000 to 2000 and in next iteration; from number 1000
to 2000, and so on. Therefore, in this case the Upd. Counter Emty Interval field must be checkmarked.