Bankruptcy law requires the fulfillment of a simple evidentiary, as stipulated in Article 8 (4) of Law No. 37 of 2004 on Bankruptcy and PKPU. The existence of the debtor's debt is one of the main requirements to apply for a declaration of bankruptcy. The issue is whether the debt is used as the basis for the request is the debt as stipulated in Law No. 37, 2004. This issue is also contained in the case of PT Prima Jaya Informatika against PT Telekomunikasi Selular. PT Prima Jaya Informatika bankruptcy petition based on the default by PT Telekomunikasi Seluler. But PT Telekomunikasi Seluler itself argued that tort actions undertaken by the company is a consequence of the default action of the PT Prima Jaya Informatika. In his defense, PT Telekomunikasi Seluler also use Doctrine Exceptio Non Adimpleti Contractus. This study uses normative juridical approach. The data used is secondary data. In this study, all materials are collected by using the library research technique. Analysis techniques used are qualitative analysis. The results obtained are the debt is used as the basis for the request by PT Prima Jaya Informatika not included in the classification of the debt according to Law No. 37 of 2004, so the bankruptcy petition did not meet the simple evidentiary as stipulated in Article 8 (4) of Law No. 37 of 2004. Later, the Doctrine of Exceptio Non Adimpleti Coontractus may be one legal basis that the debt claimed by PT Prima Jaya Informatika can not be proven by simple evidentiary . Keywords : Exceptio Non Adimpleti Contractus, Bankruptcy Law, Simple Evidentiary, Debt, Default