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Entering Documents with Input Tax 
Use
In Thailand, when you post a document with input tax in General Ledger (FI-GL), you follow the
standard procedure and, in addition, you:
Invoices that you post in Accounts Payable (FI-AP) are linked to the vendor master record, which supplies the tax returns with the name and address data. However, in FI-GL, there is no link from the invoice to the vendor master record.
When you save the document, the system assigns it a tax invoice number.
Procedure
Simulate.The system enters the business place in each line item and assigns the document header a tax invoice number, which it stores in the Document Header Text field.
Long Text.
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