How can i choose not to show a header in a report or document, for example “Invoice”. I dont want a header/logo in “Invoice” but i want it in “Sales Order”, Any idea?

For OpenERP 7 we could do that by selecting "Corporate Header" check box on Report Designer for OpenOffice when you send it to the server.

Again, any ideas?

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This is a generic procedure (but i need header/logo not to be show on invoice):

How to change the default header/footer in Odoo 8 PDF reports

To edit the header and footer for Quote/Sale orders you need to edit the QWeb view. Here is how to do this:

(1) Settings > Technical > User Interface > Views

(2) Search for “external”

(3) You will see report.external_layout, report.external_layout_header and report.external_layout_footer

(4) Edit these views as appropriate to modify the PDF version of the Quote/Sales orders

Source: https://odootricks.wordpress.com/2014/11/05/how-to-change-the-default-headerfooter-in-odoo-8-pdf-reports-salequoteinvoice/