Hi @Pan123,
thank you for sharing your question with the Wefugees Community!
The "Erkennungsdienstliche Behandlung" is a measure by the police or the immigration office to collect data like name, birthday, homecountry, fingerprints etc. It is in general used to identify a person.
Please don´t hesitate to get back to the Wefugees Community if you have further questions!
All the best
Melina