Using the Fixed Invoicing screen as an example, the following describes the effects of the options.
In this case, the fixed invoice has a base type of Monthly. This means that the Monthly tab on the Invoice Calculation Matrix screen determines how the values of the fixed invoice are calculated.
The Invoice Calculation Matrix is set up as follows:
Daily Calculation: (Monthly x 12) / 365
Weekly Calculation: (Monthly x 12) / Weeks per Year Override
Annually Calculation: Monthly x 12
Weeks per Year: 53
The effect on the Fixed Invoice screen can be seen below:
The greyed-out Calculated text boxes are calculated as follows:
Daily - 1000 (from Value text box) x 12 / 365 = 1000 x 12 / 365 = 32.88
Weekly - 1000 x 12 / 53 (from Weeks per Year Override text box) = 226.42
Monthly - 1000 (This is copied from the Value text box and is unchanged).
Annually - 1000 x 12 = 12000
If changing the Weekly Calculation option on the Invoice Calculation Matrix screen to (Monthly x 12) / 52, the resulting Weekly Fixed Invoice calculated value are:
1000 x 12 / 52 = 230.77.