Hi mates,

I got problems when sending emails, the code like following:

 

  Messaging.SingleEmailMessage mail=new Messaging.SingleEmailMessage();
  mail.setTemplateId(emailTemplateId);
  mail.setTargetObjectId(myContactId);
  mail.setWhatId(customObjectId);
  Messaging.sendEmail(new Messaging.SingleEmailMessage[]{mail});

The problem is on customObjectId, i know the whatId can be set to some standard object and the custom objects. But there are some custom objects cannot set to whatId. For example, i got a RFQ object, its fields are almost the same with another Schedule object. When setting the RFQ id, it works fine. When setting the Schedule id, i got a exception like following: