Where is "Document type" used?

There is two “document types”, in inventory and account. but I can´t find how to use it in software.
any help?
Thanks

Use Search, Tutorial and Documentation
http://www.sambapos.com/wiki/doku.php?id=sambapos_accounting_system
http://sambapos.com/wiki/doku.php?id=inventory_items

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Thanks, I understand the utility in “account transactions” but not in “inventory transactions”.

thanks