There is a broad consensus in the database research community that the traditional ACID properties are not suitable for certain application domains. Especially, long-lasting and information sharing transactions are not adequately supported. Several extended transaction models have been presented to deal with these shortcomings. Many of these models do this by relaxing the isolation property. Apotram, presented by Ole Jørgen Anfindsen, is one such model. It allows transactions to customize their degree of isolation. This is achieved by introducing two mechanisms, parameterized access modes and nested databases. Apotram requires transactions to be able to modify their degree of isolation dynamically. This is achieved by allowing transactions to modify their associated parameterized access modes. This thesis analyzes the consequences of this requirement and points out when these modifications introduce conflicts. First, parameter modification is analyzed in the context of parameterized access modes only, then the integration of access modes and nested databases is investigated. Furthermore, a set of strategies for resolving and avoiding conflicts are introduced and discussed.