How to find why address book Next Number is skipping?

Any ideas of this issue?I created a service request already but would like to gather more information or ideas from our community.

We have been having question about why address book Next Number is skipping sporadically for years and now this issue is getting more serious as the next number is skip to 7 digits. Our current next number for address book is 1005024 (7 digits) but there are only 45870 (5 digits) records totally in table F0101. So the gap of skipped next number is huge.

The document "E1: 01: FAQ - Frequently Asked Questions about Address Book Next Numbers (P0002) [ID 759399.1]" was found on Oracle Support website and the same issue is displayed on the item 1 there (1. Why are Address Book Next Numbers Skipping Sporadically? Next Numbers by Company is not active and Check Digit functionality is not active? ). The resolution in the document is actually suggesting us to monitor what applications are causing the problem - it seems it is not easy to find a solution. We are writing this Service Request hoping to get your experience or suggestions before