English to French Law/Patents Law (general) testament

Bonjour, dans le cadre d'un testament, j'ai cette expression qui revient assez souvent. Comment la comprenez-vous ?

Re: Estate of xxx, Petition for Informai Probate of Will/Appointment of Personal Representative

Dear Clerk of Court:
I represent the Estate of xxx (the "Decedent") and submit the following forms on behalf of xxx, the named Personal Representative, with respect to the Decedent's Last Will and Testament:
1. Petition for Informal Probate of Will/ Appointment of PR (MPC 150);
2. Surviving Spouse, Children, Heirs at Law (MPC 162);[...]

J'ai pensé à Demande de validation non officielle du testament ?