Associating GUI/VAT Number Prefixes with Format Codes
Access the GUI/VAT Prefix Revision form.
- Happen YM (happen year and month)
- Enter the Taiwanese year and month of transactions for which you set up the association. 
- GUI/VAT Prefix
- Enter the two-character GUI/VAT prefix for which you set up the association. 
- Format Code
- Enter a value that exists in the GUI/VAT Format Code - Purchase (75T/F2) UDC table to specify the GUI format code for which you create the association to the prefix. Values for input tax are: - Blank: blank - 21: Triplicate GUI / Computer GUI - 22: Other Doc With Tax Amount - 23: Triplicate Purchase Return / Allowance - 24: Duplicate Purchase Return / Allowance - 25: Triplicate Cash Register GUI - 26: Summary Triplicate / Computer GUI With Tax - 27: Summary Other Doc With Tax - 28: VAT Payment Document - 31: Triplicate / Computer GUI