Prerequisites
Before you complete the tasks in this section:
- Set up the user preferences with a Localization country code of TW (Taiwan). 
- Specify Y in the Link AR To GUI field on the GUI/VAT Declaration Site form for the declaration site for which you are entering transactions. 
- Set up customer constants for the customer for whom you are entering invoices or sales orders. 
- Set up and activate a user/declaration site mapping for the user who will enter invoices or sales orders. 
- Set up a GUI/VAT number segment batch for the declaration site and declaration period that are specified in the processing options of the GUI/VAT Creation From Selected AR program (P75T004R) or the GUI/VAT Creations from Selected SO program (P75T004O). 
- Verify that the version of the GUI/VAT Transaction program (P75T004) that you are using has the value of SAL (sales) in the Transaction Type of GUI/VAT processing option. 
- Verify that corresponding versions exist for the standard software transaction entry programs and the PO GUI/VAT Transaction (P75T003) and GUI/VAT Transaction (P75T004) programs. - See Understanding Corresponding Versions for GUI/VAT Transactions.