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Posting Vendor Invoices (FI-AP) 
Prerequisites
Make sure that you have defined your
business place, tax codes, and Government Uniform Invoice (GUI) formats in Customizing.Procedure
In Taiwan, when you post a vendor invoice in Accounts Payable (FI-AP), you:
entering the business place in vendor invoices (FI)

If your vendor’s GUI registration number is 12345678, enter TW12345678 in field Payment ref.
Posting a series of vendor invoices as a single accounting document
If you have a series of vendor invoices that have already been paid by an intermediary, for example hotel and restaurant expenses paid by your employee, you have the option of entering these invoices as a single accounting document. To do this, you need to use the complex posting transaction:
Result
The system:

You apply the same procedure when you post a credit memo.
If you need to reverse a document, the system automatically copies the business place and the reference number of the vendor invoice to the reversing document.
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