Re the aggregator transformer: I have an energy model of a housing stock of a city. We're using the aggregator to add all the dwelling units up to whole buildings by the Building ID attribute, but the buildings and energy are added up incompletly.

For instance, one 58 unit apartment results in 17 rows with variously 1-24 units added together. We can't explain why this is happening but need to fix it. Have also tried adding a dupliate filter and another aggregator but this didn't work. Any suggestions are appreciated.