An enterprise write a payment voucher for purchasing its own goods(stationery) for enterprise own use. How to treat this transaction?

The answer will depend on what accounts your company uses and how they record purchases of office supplies.
The most common method is: Debit Office Supplies (or similarly named account) and Credit Cash

Or there is this method: Debit Office Supplies Expense (or similarly named account) and Credit Cash. This method is used if your company records expenses when purchases are made, but you would have to do an adjusting entry to Office Supplies and Office Supplies Expense at the end of your accounting period.

If I read your question correctly you are transferring inventory for internal use so you debit Office Supplies Expense and credit Inventory