ENH: Add status code for key errors

include/caosdb/status_code.h

@@ -61,6 +61,7 @@ enum StatusCode {
   FILE_DOES_NOT_EXIST_LOCALLY = 34,
   FILE_UPLOAD_ERROR = 35,
   FILE_DOWNLOAD_ERROR = 36,
+  ENUM_MAPPING_ERROR = 37,
   OTHER_CLIENT_ERROR = 9999,
 };
 

src/caosdb/transaction.cpp

@@ -102,6 +102,8 @@ auto get_status_description(int code) -> const std::string & {
     {StatusCode::EXTERN_C_ASSIGNMENT_ERROR,
      "You tried to assign a new object to the wrapped void pointer. You have "
      "to delete the old pointee first."},
+    {StatusCode::ENUM_MAPPING_ERROR,
+     "The role, importance, or datatype you specified does not exist."},
     {StatusCode::OTHER_CLIENT_ERROR,
      "This is code is reserved to errors raised by other clients wrapping the "
      "C++ client (or its Extern C interface).  This should never occur when "