--- a/OrthancFramework/Sources/Enumerations.cpp	Tue Mar 02 16:51:19 2021 +0100
+++ b/OrthancFramework/Sources/Enumerations.cpp	Tue Mar 02 19:36:59 2021 +0100
@@ -187,6 +187,9 @@
       case ErrorCode_BadRange:
         return "Incorrect range request";
 
+      case ErrorCode_DatabaseCannotSerialize:
+        return "Database could not serialize access due to concurrent update, the transaction should be retried";
+
       case ErrorCode_SQLiteNotOpened:
         return "SQLite: The database is not opened";
 
@@ -2141,6 +2144,9 @@
       case ErrorCode_BadRange:
         return HttpStatus_416_RequestedRangeNotSatisfiable;
 
+      case ErrorCode_DatabaseCannotSerialize:
+        return HttpStatus_503_ServiceUnavailable;
+
       case ErrorCode_CreateDicomNotString:
         return HttpStatus_400_BadRequest;