diff --git a/api/src/parser/statements/checks.py b/api/src/parser/statements/checks.py
index c7ce031..4d52634 100644
--- a/api/src/parser/statements/checks.py
+++ b/api/src/parser/statements/checks.py
@@ -77,7 +77,8 @@ def run_statement_checks(
     relations = list(config.relations_for(form))
     subline_rules = _subline_rules(lines, form, rules) if config.subline_check else []
     relations.extend(subline_rules)
-    checks = StatementChecks()
+    hard: list[FailedRelation] = []
+    soft: list[FailedRelation] = []
     warnings: list[str] = []
     for column_index, amounts in enumerate(_amounts(lines, column_count)):
         for rule in relations:
@@ -91,13 +92,14 @@ def run_statement_checks(
                 continue
             failed = FailedRelation(column_index=column_index, relation=rule.relation, expected=expected, actual=actual)
             if rule.strict:
-                checks.relations_failed.append(failed)
+                hard.append(failed)
                 warning_msg = f"соотношение «{rule.relation}» нарушено (колонка {column_index}): {expected} ≠ {actual}"
                 warnings.append(warning_msg)
             else:
-                checks.soft_relations_failed.append(failed)
+                soft.append(failed)
                 warning_msg = (
                     f"мягкое соотношение «{rule.relation}» нарушено (колонка {column_index}): {expected} ≠ {actual}"
                 )
                 warnings.append(warning_msg)
-    return checks, warnings
+    # списки задаются явно: `to_wire` сериализует только заданные поля, пустой список = «проверено, сошлось»
+    return StatementChecks(relations_failed=hard, soft_relations_failed=soft), warnings
diff --git a/api/tests/unit/parser/statements/test_checks.py b/api/tests/unit/parser/statements/test_checks.py
index 8083ba0..28d9d78 100644
--- a/api/tests/unit/parser/statements/test_checks.py
+++ b/api/tests/unit/parser/statements/test_checks.py
@@ -187,3 +187,29 @@ def test_target_present_members_absent_as_zero(rules: Rules) -> None:
     # Правило 1100 = 1105 + … (strict: true) должно нарушиться
     failed_relations = [item.relation for item in checks.relations_failed]
     assert any("1100 =" in rel for rel in failed_relations)
+
+
+def _full_balance(total: str) -> list[StatementLine]:
+    return [
+        line("1150", "100"),
+        line("1100", "100"),
+        line("1210", "50"),
+        line("1200", "50"),
+        line("1600", total),
+        line("1310", "150"),
+        line("1300", "150"),
+        line("1700", "150"),
+    ]
+
+
+def test_failed_and_empty_relation_lists_reach_the_wire(rules: Rules) -> None:
+    """Проверенный документ сериализует `relations_failed`/`soft_relations_failed` всегда: с нарушением и пустыми."""
+    broken, _ = run_statement_checks(_full_balance("155"), 1, "BALANCE", rules)
+    clean, _ = run_statement_checks(_full_balance("150"), 1, "BALANCE", rules)
+
+    wire = broken.to_wire()
+    assert [item["relation"] for item in wire["relations_failed"]] == ["1600 = 1100 + 1200", "1600 = 1700"]
+    assert wire["relations_failed"][0]["expected"] == "155"
+    assert wire["soft_relations_failed"] == []
+    assert clean.to_wire()["relations_failed"] == []
+    assert clean.to_wire()["soft_relations_failed"] == []