Article 79 · Verification of capacity and statutory representation
Civil Procedure Act of the Republic of Serbia
The summons tells a statutory representative to prove that status at the first procedural step under Article 79(2). This is the form’s advance instruction about authority, not a finding that a particular representative in this case lacked it.
Short quotation from the source
A person appearing as a statutory representative must prove their authority to act in that capacity when taking their first procedural action (Article 79, paragraph 2, of the Civil Procedure Act).