My content type has a field call tracking code, I have granted permission for users are able to create content. When they create content, they cannot see tracking code field but after they submit the content, they will see a tracking code string in message area.
In that node I also have reference field with other content type, so the string that I expect to show must include the id of reference node and id of the node being created.
EX: P1C2 (1 is id of reference node, 2 is id of node being created)
Does drupal have any modules support to do that or I must do it programmatically and how can I build the coding for that? Thank you all!