I implemented a workflow and workflow process for a custom table in adempiere 3.80. But when I click on the docaction button a popup will appear and when I click on its OK button, a message box appeared as terminated. In eclipse, the console shows an exception
java.lang.IllegalStateException: Persistent Object not DocAction.
Check that your custom table has the model classes generated and that your MCustomTable class implements the DocAction interface.
Here is the MOrder model
public class MOrder extends X_C_Order implements DocAction
{
....