> ## 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 Issues

> Data Model Issues — common questions about Nextedy POWERSHEET.

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

<AccordionGroup>
  <Accordion title="Why do I get errors about entity types not being found?">
    This error occurs when the sheet configuration references an entity type name that does not exist in the data model `domainModelTypes` section. Entity type names are case-sensitive and must match exactly — `SystemRequirement` is not the same as `systemRequirement` or `Systemrequirement`. Verify naming consistency between your data model, sheet configuration column paths, and `sources` definitions.

    <Frame>
      <img src="https://mintcdn.com/none-17b4493f/3Zik2OH750CE3kB4/powersheet/diagrams/faq/troubleshooting/diagram-1.svg?fit=max&auto=format&n=3Zik2OH750CE3kB4&q=85&s=a14c4e57b7b881fce854fd02bd4365bd" alt="diagram" style={{ width: "500px", maxWidth: "100%" }} width="500" height="180" data-path="powersheet/diagrams/faq/troubleshooting/diagram-1.svg" />
    </Frame>

    For a detailed walkthrough, see [Fix Type Name Errors](/powersheet/guides/troubleshooting/fix-type-name-errors).
  </Accordion>

  <Accordion title="Why are my relationships not loading or navigating correctly?">
    Relationship navigation depends on three things being correctly aligned: the `from` and `to` entity types must exist in `domainModelTypes`, the `linkRole` must match a link role defined in the Polarion project, and the `direct` and `back` navigation property names must be referenced correctly in column binding paths and `expand` arrays. If any of these are mismatched, navigation paths will silently return no data. Review the [Fix Relationship Errors](/powersheet/guides/troubleshooting/fix-relationship-errors) guide for step-by-step diagnosis.
  </Accordion>
</AccordionGroup>

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