If an activiti model is created with a gateway, but then the gateway deleted, the corresponsing sequence flows seems to still exist. This results in the error 'SequenceFlow has no target activity'
Create a model with a gateway (either type) and add sequence flows
Export to BPMN 2.0 XML (all fine)
Delete the gateway
Export to BPMN 2.0 XML (results in error)
Even if you recreate it with a new gateway, this doesn't solve the error which leaves you with a broken model that can't be fixed
(screenshots and model attached)
Possibly related to bug