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Software flexibility has always been one of the most important features for all end-users. It includes the ease of infrastructure configuration and reaches possibilities for software functionality settings. In this paper, a problem of reaching the flexibility desired by end-users is described and partially investigated, as regards approaches to entity configuration. This configuration includes setting up functionality to allow end-users configure possible entity states that cannot be known at the stage of the concrete software development. Hereafter, we refer to constraining the collection of next reachable states of some entity as transition rule. Existing software feedback management software products are reviewed that serve as an example of a domain with entities that have complex and dynamic sets of states, and do not have predefined collections of them as well as rules for their transition. The main advantages and disadvantages of similar systems and their approach to entities' state management are analyzed. Examples and descriptions of possible states of entities and rules of their transitions are given. The prospects of applying the graph theory to solve the problem posed in the article are investigated. Based on the research, the architecture was designed. A software system was implemented according to the architecture; it consists of mobile and browser (both as a web-site and a Google Chrome browser extension) clients. The goal of the system is to provide project teams with an easy-to-use tool for collecting and storing different feedbacks from end-users and stakeholders. In particular, the system designed and developed during the investigation provides the ability to create feedback templates with different sets of fields and different types of each. The article focuses on the process of managing feedback states and the implementation details of this functionality in the system that was developed. The results of the study conducted in the article were applied to store and validate the dynamic states of the feedbacks to software products. The choice of an interface solution to represent the rules of transition between states is justified. The algorithm for checking the correctness of the states and the rules of their transitions in the system for feedback management is investigated and applied. In particular, the application of Tarjan algorithm for validating states and theirs transitions is described as well as implemented in the system that was developed.

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