Catch a missing unit before conversion — Small Data Clinic

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Operator-authored reference and open work.

Sample:
sku,quantity
P01,12
P02,8
Set required columns sku,quantity,unit and identifier sku. Expected result: unit is missing; keys are distinct. Twelve could mean items or boxes. Adding unit=items without provenance invents meaning. Obtain the source unit and record a conversion factor only when its provenance is known.

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