Abstract. Recently, a trend towards business processes in Business-toBusiness e-Commerce (B2B) is apparent. One of the most promising approaches is UN/CEFACT’s modeling methodology (UMM) based on UML. However, developing a new UMM model for each small variation in a business process would lead in a multitude of “similar” business processes. Thus, a more generic UMM model together with well-defined constraints for different business environments is a better approach to ensure unambiguity. In this paper we develop templates for such constraints based on an extended version of OCL. 1 Motivation For a long time standardization in Business-to-Business e-Commerce (B2B) followed a pure data centric approach. Recent standardization approaches take business processes into account. The most prominent examples include: Business Process Execution Language (BPEL) [2], Business Process Modeling Language (BPML) [1], and ebXML Business Process Specification Schema (BPSS) [13]. Since all of them ...