You can submit your claim online here. When submitting a claim, you are obliged to state the nature (e.g., loan, purchase, sale, rent, wages, compensation for services) and amount of your claim and include documents that support your claim. If you are claiming a privilege, right of pledge or mortgage, a right of retention or a retention of title, you must report this and append supporting documents.
You have a privilege only when that is stipulated by law. For example, the law stipulates that a claim for the costs for applying for a declaration of bankruptcy is a privileged claim. If you are not sure whether you have a right of retention or a retention of title, check the agreement or order confirmation with the bankrupt party or refer to your general terms and conditions if you declared them applicable to the legal relationship between you and the bankrupt party.