Perbandingan hukum pemutusan surat kuasa secara sepihak antara Indonesia dan Belanda sebagai bentuk wanprestasi: studi putusan nomor 704/Pdt.G2017/PN.Mdn = Comparative law of one-sided revocation power of attorney between Indonesia and Dutch as a form of breach of contract: case study of court verdict No. 704/Pdt.G2017/PN.Mdn