ros2 msg field name reservations

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I tried to use the followin self-defined msg interface:

# MyInterface.msg
MyHeader header

and

# MyHeader.msg
uint8 id
Point3f origin

it looks like the field name header in MyInterface.msg is reserved, the msg package could be built successful, but when i use the msg to initialize a subscription by

sub_ = this->create_subscription<my_interface::msg::MyHeader>("stub_topic", 10, std::bind(&ClassNmae::sub_cb, this, _1));

and I got errors when build:

...
/opt/ros/galactic/include/libstatistics_collector/topic_statistics_collector/received_message_age.hpp:79:33: error: ‘const _header_type’ {aka ‘const struct my_interface::msg::MyHeader_<std::allocator<void> >’} has no member named ‘stamp’
   79 |     const auto stamp = m.header.stamp;
      |                        ~~~~~~~~~^~~~~
...

by changing header to a more regular word like my_header, the error disappeared.

my question is:

1. is this a field name reservation related issues?
2. if it is, where can i find some official docs explain about this?

i have refered to http://design.ros2.org/articles/inter...

but only found limited informations and no direct clues about my question.

can i have some help? thx