[WD20] - Missing header records

Hi,

From time to time user from "main" accounting pc, connect over internet connection (DDNS) into remote location (database) then :
1. hchangeconnection(), HChangeDir()
2. do few query's to take data from remote location into Data Source files
3. back connection and directory's to "main" database and
4. hcopyrecord() from query's

Sometimes, after this, new header records and line records (orders, orderline)
are added but few "old and not affected by process" header records are missing (like deleted) but records from (orderline) table are untached. I have no "delete" instruction in code. Is there knowing situation or some suggestions to make this transaction better and more secured.

Thank you !