Neighbors being automatically deleted

Hi All,
Can anyone tell me why NBR is being deleted for LTE automatically?
Vendor is Huawei.

In ANR feature of there is no attempts to define NBR for specific time.
NBR is automatically delete.

But external nbrs need to be defined right?

NBR is being deleted for whole sites and I already turned off the ANR for deletion.
But still being deleted.

You can check operation logs of this site to see what happened, who did the operation.