Change the foreign link to ServiceInstance

Change-Id: I2a3bf870d5f795a60dff168bf084cc4730882a17
diff --git a/xos/synchronizer/models/vepcservice.xproto b/xos/synchronizer/models/vepcservice.xproto
index 223ee0c..e8fd43c 100644
--- a/xos/synchronizer/models/vepcservice.xproto
+++ b/xos/synchronizer/models/vepcservice.xproto
@@ -11,6 +11,6 @@
 
 message VEpcResourceInstanceLink(XOSBase) {
     required string name = 1 [help_text = "Resource link name", db_index=True, tosca_key=True];
-    required manytoone resource_instance->KubernetesResourceInstance:vepc_resource_instance_links = 2 [help_text = "Kubernetes resource file content", db_index=True, null=False, blank=False];
-    required manytoone vepc_service_instance->VEpcServiceInstance:vepc_resource_instance_links = 3 [help_text = "Virtual EPC Service Instance", db_index=True, null=False, blank=False];
+    required manytoone resource_instance->ServiceInstance:vepc_resource_instance_links = 2 [help_text = "Kubernetes resource file content", db_index=True, null=False, blank=False];
+    required manytoone vepc_service_instance->VEpcServiceInstance:vepc_resource_instance_links2 = 3 [help_text = "Virtual EPC Service Instance", db_index=True, null=False, blank=False];
 }
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