Converted Header Problem

Headers in my document became ‘converted’ when I saved a disk in a MS format. Now, back in ODT the headers are marked as converted and I can not edit them. For example, change BOOKS to LEAFLETS seems not possible. All advice welcome!

Read these guidelines and edit your question, or better, repost without checking wiki because wiki mode prevents you from earning karma points necessary to attach sample files. I’ll delete this question as soon as I see the “ordinary” question.