Perdón, no he puesto toda la ayuda de esa propiedad.
Cita:
Specifies one or more key field names separated by a semicolon.
property KeyFieldNames: string;
Description
The KeyFieldNames property specifies the semicolon-separated list of key field names, which uniquely identify each dataset record. You should set key field names in the following cases:
ˇ if you want to perform in-sync operations on TDataSet in a detail data controller such as editing and adding records;
ˇ if you need to delete several selected records from the corresponding dataset;
ˇ if you want to speed up navigation when data in your grid control is synchronized with TDataSet.
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