Set DataField to the field name of the field component that the check box represents: 

DBEditEh1.DataField := 'Company';

Access by the TCustomDBEditEh to the dataset in which the field is located is provided by a TDataSource component, specified in the DataSource property. 

If the DataField refers to a database field that contains integer or floating-point data, only characters that are valid in such a field can be entered in the edit box. Characters that are not legal are not accepted. 

If DataField and DataSource properties are empty then the control works in non data-aware mode and writes data in internal variable.

TDBDateTimeEditEh Properties