Since Appoxee SDK V2.0 you have the ability to set custom fields
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//Universal Value Getter, List of Attributes as incoming parameter, List of Values as returning values
public static ArrayList<String> getFromAttributeList(ArrayList<String> listOfAttributes)
//Set Custom Field, Return TRUE on success
// aValue - Can be String containing text / number representation (Long,Int,Float,Double) / Date in the following pattern : yyyy-mm-hhThh:mm:ss
public static boolean setCustomField(String aName,Object aValue)
//Unset Custom String Fields, Return TRUE on success
public static boolean unsetStringFields(Map<String,String> strFields)
Please Add guidelines for each type of field what to give (especially date)