Data Ownership
One editable home per field, everything else a reference or a labelled cache. The rule that prevents divergence rather than reporting it.
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Single source of truth, applied to product data
Everyone agrees on single source of truth in the abstract and nobody agrees on it per field. The phrase only becomes useful when it is written down as a list of fields with one owner each, and a rule about what everyone else is allowed to hold.
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DAM vs PIM: which system owns which record
The comparison charts make DAM and PIM look like competitors. They are not. One holds the asset, the other holds the product, and almost every argument between them resolves by asking which system is authoritative for the field in dispute.