The solutions that you create often include relationships A definition of how records may be related to each other. Relationships defined between entities control how Microsoft Dynamics CRM presents options for records to be linked to each other in the application., look-up fields, and related functionality or user interface that interact with other Microsoft Dynamics CRM business or custom components. These are referred to as dependencies.
A solution also includes required components, which are either present on the target Microsoft Dynamics CRM system, or included with the solution when it is imported. You cannot delete required components.
In order to delete a solution that has components with dependencies, you must first remove the dependencies. Follow these steps to view the component dependencies for a solution:
In the Navigation Pane, click Settings.
Under Customization, click Solutions.
In the list of solutions, click the solution that you want to open.
In the left pane, click Components to see a full list of solution components.
Select a component, and then on the Actions toolbar, click Show Dependencies.