| # Introduction In the Master Data, you set up a framework within which business models can be created and maintained. However, to build a business model you need to create various model items that together can make up a project model or reference model. These model items must be defined in the repository, which is a library where all the model items are stored so they can be used and reused in numerous business models. You can either build a project model based on a reference model or a reference model based on a project model. You can also create either business model from scratch. However, regardless of your choice, before you compose a business model, you first need to create model items in the repository. This chapter explains general features you must remember when you create or modify a model item in the repository. The way in which you handle these features influences the way in which you can use the model items in a business model. |