diff --git a/src/cx_ai_system_fault.clas.abap b/src/cx_ai_system_fault.clas.abap
index 3d0c230..9746b0d 100644
--- a/src/cx_ai_system_fault.clas.abap
+++ b/src/cx_ai_system_fault.clas.abap
@@ -1,5 +1,6 @@
 CLASS cx_ai_system_fault DEFINITION PUBLIC INHERITING FROM cx_static_check.
-
+  PUBLIC SECTION.
+    DATA errortext TYPE string.
 ENDCLASS.
 
 CLASS cx_ai_system_fault IMPLEMENTATION.
diff --git a/src/if_wsprotocol.intf.abap b/src/if_wsprotocol.intf.abap
index 439c8c6..de003f0 100644
--- a/src/if_wsprotocol.intf.abap
+++ b/src/if_wsprotocol.intf.abap
@@ -1,3 +1,3 @@
 INTERFACE if_wsprotocol PUBLIC.
-
+  CONSTANTS message_id TYPE string VALUE 'IF_WSPROTOCOL_MESSAGE_ID'.
 ENDINTERFACE.
\ No newline at end of file