What could cause a workbook to have dependencies on other resources?

The inclusion of drill down structures or reference worksheets is a valid reason for a workbook to have dependencies on other resources. When a workbook is designed with drill down structures, it often layers data from multiple sources, allowing users to explore detailed information dynamically. This means that the workbook relies on the underlying data structures and corresponding reference worksheets to function correctly. Therefore, whenever changes are made to these referenced resources, it may also affect how the workbook operates and the data it displays.

Additionally, drill down structures enable users to break down aggregate data into more granular views, which directly ties the workbook's functionality to the data sourced from these additional layers or worksheets. Establishing such dependencies is essential for providing complete and effective analytical capabilities within the workbook. Hence, when these references or structures are present, they inherently create associations with other resources.