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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.
diagram
For a detailed walkthrough, see Fix Type Name Errors.
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 guide for step-by-step diagnosis.