Validate final identity fields as application payload

internal/engine/compose.go

@@ -406,7 +406,7 @@ func validateRegisteredSequences(claims []compositionClaim, identityFieldsByPath
 		contribution := validatedSequence{items: node.Sequence}
 		records, diagnostics := validateNormalizedSequenceIdentityFrom(node, claim.path, identityFields, sequenceIdentityDiagnosticCodes{
 			invalid: CodeComposeInvalid, conflict: CodeComposeConflict,
-		}, start)
+		}, start, sequenceStructuralRecord)
 		if len(diagnostics) != 0 {
 			return nil, nil, diagnostics
 		}