Online Documentation for Advanced Data Import for RAD Studio VCL
TQImportFieldFormat represents an item in the TQImportFieldFormats collection. The properties of this object allow you to set various data formats for the certain dataset field. These properties are read in the definite order: generator properties (GeneratorValue and GeneratorStep), ConstantValue, Null properties (NullValue and DefaultValue), Quotation properties (QuoteAction, LeftQuote and RightQuote) and String Conversion properties (CharCase and CharSet).
Thus, if you set GeneratorStep to a value other than 0, no other properties are taken into consideration; if you set ConstantValue or NullValue and DefaultValue properties, then you can set only Quotation properties and String Conversion properties.