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TYPE_E_DUPLICATEID
TYPE_E_DUPLICATEID: an inherited Automation/type-library hierarchy contains a duplicate identifier
TYPE_E_DUPLICATEID (0x800288C6) identifies a specific boundary: an inherited Automation/type-library hierarchy contains a duplicate identifier. Keep it separate from neighboring errors that may occur in the same product but represent a different lookup, state, trust, or transport decision.
Evidence to capture
Capture the containing type, inheritance chain, duplicate MEMBERID/GUID, imported type libraries, and build step that emitted the metadata. Names may be unique while numeric IDs still collide.
Corrective test
Assign stable unique identifiers in the producer and rebuild; verify consumers see one definition for the previously duplicated ID. Preserve the original identifiers while testing; if another HRESULT appears after this boundary is fixed, treat that value as the next-stage result.
Technical references
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