The Solution Architect should recommend a Partner Community license for this requirement. This license is designed for external partners and allows them to access and interact with Salesforce data and features, including submitting and viewing cases and tracking opportunities. Additionally, the Partner Community license includes the ability to create and view dashboards within the community.
https://help.salesforce.com/s/articleView?id=users_license_types_communities.
htm&language=en_US&type=5
For partners to log and view cases as well as track opportunities, and view dashboards within the community, the Partner Community license is the appropriate choice. This license is designed for partner relationships and provides the necessary access to Salesforce objects and functionality needed for these tasks. Salesforce's licensing guide outlines the features available with the Partner Community license, supporting this recommendation.

In an enterprise architecture, data warehouses typically serve as a System of Record (SoR). They contain the authoritative data source for a given piece of information and are used for storage and analytics purposes. The Systems of Engagement (SoE) framework would classify the data warehouses as SoR because they maintain the official copy of the data being used by various systems. This classification aids in deciding on integration strategies and data flow within the enterprise architecture.

Creating a permission set that grants field service users access to the Order object is a granular and secure way to provide the necessary data visibility. This allows for precise control over which users have access to order data without impacting other profiles or requiring additional licenses. Salesforce's permission set documentation provides guidelines on how to grant specific access rights to users, ensuring they have the information needed to perform their job functions effectively.