Claims for damages arise in the law of damages and pain right either from a contractual relationship out, for example, in the case of behavior contrary to the contract of a party, cf. in particular the §§ 280 ff. BGB. However, claims for damages may also arise from the law, eg in the case of unlawful damage to foreign legal interests, cf. §§ 823 ff. BGB. This list is far from exhaustive. You should therefore have an accomplished lawyer review the assessment of your potential claims for damages.