International comparison studies on economic activity are often hampered by the fact that access to business microdata is very limited on an international level. A project launched by the Institute for Employment Research in cooperation with Cornell University, USA tries to overcome these limitations by improving access to Business Censuses from multiple countries based on synthetic data. Starting from the synthetic version of the longitudinally edited version of the U.S. Business Register (the Longitudinal Business Database, LBD), the idea is to create similar data products in other countries by applying the synthesis methodology developed for the LBD to generate synthetic replicates that could be distributed without confidentiality concerns. In this talk we discuss some pitfalls encountered while trying to harmonize the German business data collected at the IAB with the structure of the LBD. We also present some first results of the synthesis process and talk about plans for the future.