In Organization administration > Organizations > Legal entities it's impossible to set that the primary address is not primary any more. The only thing we could do is to edit the existing primary address with new one (because LE changed their headquarters). Now, when we print already posted invoices, a new address appears on them, and in our country, it is forbidden to change such information on already posted documents. 

Idea is to be able to change the Expiration date on the primary address (by default is Never) so that the old address remains on the already posted documents, and the new one on those created after the change. Or another solution- to be able to set completely another new address primary, while the old documents stay intact.