In the BusinessManager Migration pdf, on page 5 there is a note referring document called DB ImportExport.doc, where I can find this document?.
" Note: To preserve the identity information in SQL server tables, perform the steps described in the BImportExport.doc File "
Now we are trying to upgrade from 7.5.1 to 7.6.2, the process must do these steps: 7.5.1 -> 7.5.2 -> 7.6.1 -> 7.6.2, but the process requires to install on a fresh database and then export/import data, apparently the document explains how to do.