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The answer is to use the "Ref Account" field (introduced in version 2017-03 of Dataloy BI). By also adding a filter on this field, filtering only demurrage, you will get only address commissions referring to demurrage amounts. All other address commissions (i.e. referring to freight, various revenue etc) would not be included. So, your filters should look something similar to this:
By using similar filters you can of course create freight only or various revenue only reports, or a mix of any of these to get your flavour of report.
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