käsittelemänsä
Käsittelemänsä is a Finnish word that translates to "handled," "dealt with," or "processed" in English. It is the past participle of the verb käsitellä, which means to handle, process, deal with, or treat. The ending "-mänsä" is a possessive suffix, indicating that the action of handling or processing was done by the subject itself or on its own behalf.
This grammatical form is often used to describe something that has undergone a certain treatment or action.
In a legal context, käsitellä can mean to try a case, and käsiteltävänä would mean "being tried"