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Posting Customer Invoices (SD) 
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 Sales and Distribution (SD), you:
posting customer invoices (SD)
Result
The system:

You apply the same procedure when you enter a credit memo. The system automatically updates the document with the GUI number of the original sales invoice.
If you need to cancel a document, the system automatically copies the business place and the GUI number of the customer invoice to the cancellation document.
