About 400,000 Serbs lay claim to property in the Federation of BiH, but there is a risk of their losing the property in the process of harmonization of cadastral and land registry data on immovable property, which is conducted in a non-transparent manner in the Federation. As part of a joint action of the Republic of Srpska and Serbia, a campaign is starting with the aim of informing the concerned Serbs in the Federation about the ways to protect their rights. It is worrying that Serbs originating from the Federation of BiH are being left without their property during data harmonization, without even being notified, because the public call is published only in the Official Gazette of the Federation and local daily newspapers, which are not available to Serbs living around the world.