Purpose - Employment and performance of enterprise resource planning (ERP) systems process is a technical-social change affecting strategic and operational levels of a company and therefore its performance will fulfil expected productivity of the organization using these systems. Therefore, it is necessary to examine effective factors in ERP acceptance before its performance. This study aims to investigate the effective factors in ERP acceptance. Design/methodology/approach - This research considered 14 key effective factors in ERP acceptance in LME companies. The research method was descriptive and a survey was carried out. In order to obtain the research goals statistical methods, descriptive-deductive, have been utilized in this study. The author used the Friedman test to score research variables and the Mann-Whitney test to examine the current gap between manufacturing-service companies. Findings - The results of the research indicate the acceptance of ERP in the integration of applications, integration of information systems, increase in demands for real and on-time information, information generation for decision-making and ultimately for costs. Originality/value - The paper provides useful information on employment and performance of ERP systems.