> ## Documentation Index
> Fetch the complete documentation index at: https://learn.nextedy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Data Model Guides

> These guides cover common data model configuration tasks in Nextedy POWERSHEET.

export const LastReviewed = ({date}) => {
  if (!date) return null;
  const formatted = new Date(`${date}T00:00:00Z`).toLocaleDateString("en-US", {
    year: "numeric",
    month: "long",
    day: "numeric",
    timeZone: "UTC"
  });
  return <p className="mt-10 text-sm text-gray-400 dark:text-zinc-500 not-prose">
      Last reviewed on {formatted}
    </p>;
};

<Columns cols={3}>
  <Card title="Create an Entity Type" icon="file" href="/powersheet/guides/data-model/create-entity-type">
    Add a new entity type to your data model and map it to a Polarion work item type.
  </Card>

  <Card title="Configure a Relationship" icon="file" href="/powersheet/guides/data-model/configure-relationship">
    Define relationships between entity types with link roles and navigation properties.
  </Card>

  <Card title="Configure Constraints" icon="file" href="/powersheet/guides/data-model/configure-constraints">
    Scope entity loading, creation, and picker filters using constraint rules.
  </Card>

  <Card title="Set Entity Permissions" icon="file" href="/powersheet/guides/data-model/set-permissions">
    Control read and write access at the entity and property level.
  </Card>
</Columns>

## Advanced Guides

* **[Create Bidirectional Links](/powersheet/guides/data-model/create-bidirectional-links)** -- Set up forward and reverse navigation properties for full two-way traversal
* **[Configure Many-to-Many Relationships](/powersheet/guides/data-model/configure-many-to-many)** -- Handle complex multi-item relationships between entity types
* **[Validate Your Data Model](/powersheet/guides/data-model/validate-model)** -- Check your data model for naming errors, missing references, and configuration issues

<Tip title="Recommended Order">
  For a new data model, follow these guides in sequence: **Create an Entity Type** first (which includes Polarion type mapping and property definitions), and then **Configure a Relationship**. Add constraints and permissions after the basic structure is working.
</Tip>

## Related Resources

* [Data Model Reference](/powersheet/reference/data-model/index) -- full property-level reference for data model YAML
* [Example Models Reference](/powersheet/reference/example-models/index) -- complete model examples to study
* [Creating Your First Data Model](/powersheet/getting-started/first-data-model) -- introductory tutorial

<LastReviewed date="2026-07-02" />