Since an increasing amount of business rules management solutions are utilized, organizations search for guidance to design such solutions. As the amount of BRMS-implementations increase, the amount of implementation challenges experienced in practice increase as well. Therefore, it is of importance to gain insights into these implementation challenges which can help guide future implementations of BRMS. Smit, Zoet and Versendaal (2017) described the challenges regarding elicitation, design and specification of business decisions and business logic; in this study, we identify the main challenges regarding 1) the verification and 2) validation of business decisions and business logic in the Dutch governmental context. Building on the collection and the analysis of two three-round focus groups and two three-round Delphi studies we report on the 17 challenges experienced by the participants. The presented results provide a grounded basis from which empirical and practical research on best practices can be further explored.