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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.