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How do I change a GST figure without overwriting the Net figure?

ContactsLaw uses a consistent set of rules to calculate the GST figure in situations where the user is presented with Net, GST and Total columns; e.g. transaction line items, anticipated disbursements, etc.
  • Entering a Net figure will cause the GST figure to be recalculated (according to the configured tax rate). This will update the Total figure to (Net+GST).
  • Entering a Total figure will cause the GST figure to be updated, on the assumption that GST applies uniformly to the item. This will update the Net figure to (Total-GST).
  • Entering a GST figure will update the Net figure to (Total-GST).

This behaviour may have unintended consequences if figures are entered from left to right. Instead, enter the Total and then change the GST figure if the calculated amount is not correct for the item.