Section 58(11A) in Kerala Value Added Tax Rules, 2005
(11A)Where different series of bills, invoices or cash memoranda are maintained it shall be in `alpha numerals' only and the alphabets shall precede the numerals. The maximum alphabets and numerals that can be used in a series shall be limited to `three' and `seven' respectively. The invoice number shall not contain any special characters like `coma, star, slash, full stop, hyphen or any symbols' and shall be written continuously without blank spaces.
