Finland has set numeric goals for the development of open access. However, at the moment, no system is available by which this development could be monitored. Poor quality in the metadata records in universities' research information databases prevents metadata-based analysis of open access publishing progress. This paper shows how the quality problems of Finnish publication data can be resolved through centralizing the services and processes of metadata creation and by improving the interoperability of systems involved in the processes. As a result, this study describes an environment where reliable measurement of open access is possible and presents suggested actions for improving the Finnish publication data collection.