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>Namely, it will use toForm.icMainAlias and toControl.ControlSource for icDBTable and icCKField. However, I am stumped about what to use for THIS.icPKAliasField and THIS.icPKFieldExpression since there is no primary key in table.
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While there is no 'Primary Key' in a free table (because that is an attribute a DBCs), you will have an index key that defines the uniqueness of the record. Use that field or expression (if it is a combination of two or more fields).

HTH.