IE: Design. Remove calculated fields

• The last step is to remove any fields which may be calculated using other fields.
• If calculated fields are required to be retained for any specific purpose (e.g.: retained for audit) note this on you documentation.

• In this invoice
  • Amount = Quantity * Price,
  • GST = Total Amount * 12.5%
  • Total Due = Total Amount + Freight + Insurance + GST

Ack: K. Allpress Unitec99: [Rev 17/05/99] 16/5/99 ©1999 V/2-Com (Verhaart), Box 8415, Havelock North, New Zealand.