(TBarcode1D_EAN128)
Specifies the start position of the barcode piece which will be used to calculate the check digit in an EAN-128 barcode symbol.
property CheckStart: Integer;
In the EAN-128 barcode symbology, an extra check digit is required for some AI fields, you can set the AutoCheckDigit property to true to automatically calculate the check digit. The CheckStart property specifies the start index of the barcode piece which will be used to calculate the check digit in the Barcode or Data (only for Delphi/C++ Builder 2009 or later) property.
Note, if an EAN-128 barcode contains more than one type of information. CheckStart and CheckLength properties will only work for last data field. For the CheckStart property, the index of first AI's first character is 1.