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Posting Customer Invoices (FI-AR) 
Prerequisites
Make sure that you have defined your
business places, tax codes, Government Uniform Invoice (GUI) formats, and GUI numbers in Customizing.Procedure
In Taiwan, when you post a customer invoice in Accounts Receivable (FI-AR), you:
entering the business place in customer invoices (FI)
Result
The system:

You apply the same procedure when you enter a credit memo. However, you must remember to enter the GUI number of the original sales invoice in the Reference field.
If you need to reverse a document, the system automatically copies the business place and the GUI number of the customer invoice to the reversing document.
