diff --git a/validation/error_logging/error_message.py b/validation/error_logging/error_message.py
index 988caa4..7153770 100644
--- a/validation/error_logging/error_message.py
+++ b/validation/error_logging/error_message.py
@@ -509,19 +509,19 @@ class ErrorMessage():
     Ontobiotope Error Codes
     """
 
-    def CTR01(self):
+    def VRS01(self):
         return "The 'Version' columns is a mandatory field in the Version Sheet."
 
-    def CTR02(self):
+    def VRS02(self):
         return "The 'Version' columns is empty or has missing values."
     
-    def CTR03(self):
+    def VRS03(self):
         return "The 'Date' columns is a mandatory field in the Control Sheet."
 
-    def CTR04(self):
+    def VRS04(self):
         return "The 'Date' columns is empty or has missing values."
 
-    def CTR05(self):
+    def VRS05(self):
         return f"The version {self.value} is the only one to be used."