What is an 'aggregation type' when creating a Custom KPI?
When you create a non-financial KPI the "aggregation type" determines how results and targets roll-up to quarterly and annual periods.
For example, 'Average' take the average monthly results/targets for that quarter or year.
'Sum' will add the monthly results/targets for that quarter or year.
'Balance' will choose the last months results, as the results for the quarter or year.