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  • Bruno Antonio thinks this is interesting:

Rather than altering the declared grain to be something unnatural such as one row per payment method per product on a POS transaction, you would likely capture the payment method in a separate fact table with a granularity of either one row per transaction (then the various payment method options would appear as separate facts) or one row per payment method per transaction (which would require a separate payment method dimension to associate with each row).

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Cover of The Data Warehouse Toolkit: The Definitive Guide to Dimensional Modeling, 3rd Edition

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Como é que isto funciona mesmo?
Percebo o problema mas as resoluç~ies são confusas.