Keabsahan surat tanda bukti hak ahli waris warga negara asing sebagai alas hukum bagi kedudukan ahli waris dan klaim terhadap harta peninggalan dari pewaris yang berkewarnegaraan indonesia. studi kasus putusan mahkamah agung nomor 866 k/pdt/2015 = The validity of the assessment letter from foreign beneficiery as a legal ground for the capacity of the beneficiery and claim against the probate from the indonesian citizen inheritor case study from supreme court decision number 866k pdt 2015