diff --git a/goodwe_controller/test_settings.py b/goodwe_controller/test_settings.py
index c312adf..89455cb 100644
--- a/goodwe_controller/test_settings.py
+++ b/goodwe_controller/test_settings.py
@@ -31,6 +31,7 @@ import translations_lint as TL                                  # noqa: E402
 import ux13_demo as D                                           # noqa: E402
 from app import selfconfig, uilayout as L, uimodel as U, uipage, web  # noqa: E402
 from app.validate import validate_startup_config                # noqa: E402
+from named_absence import field                        # noqa: E402
 
 fails = []
 
@@ -78,6 +79,7 @@ for _g in LAYOUT["groups"]:
             _flat.append((_g["id"], _f))
             _flat += [(_g["id"], _s) for _s in _f.get("fields", [])]
 _keys = [f["key"] for _g, f in _flat]
+FIELD = {f["key"]: f for _g, f in _flat}
 check("the six groups, in the design's order",
       [g["id"] for g in LAYOUT["groups"]]
       == ["meter", "inverters", "tariff", "safety", "maintenance", "tuning"]
@@ -93,7 +95,7 @@ print(f"    fields per group: {_counts}")
 check("every field has a label, and every option field's label is its "
       "translation without the group prefix",
       all(f["label"] and " · " not in f["label"] for _g, f in _flat)
-      and next(f for _g, f in _flat if f["key"] == "meter_source")["label"]
+      and field(FIELD, "meter_source")["label"]
       == "Where the meter reading comes from")
 _ranged = [(f["key"], f.get("min"), f.get("max")) for _g, f in _flat
            if f["control"] in (L.SLIDER, L.LOCKED)]
@@ -102,16 +104,16 @@ check(f"every slider and locked value has its range from the schema "
                                for _k, lo, hi in _ranged)
       and ("peak_cap_w", 500.0, 15000.0) in _ranged)
 check("the peak limit is a kW slider over a value stored in W",
-      next(f for _g, f in _flat if f["key"] == "peak_cap_w")["scale"] == 1000)
+      field(FIELD, "peak_cap_w")["scale"] == 1000)
 _choice = [f for _g, f in _flat
            if f["control"] in (L.SEGMENTED, L.SELECT, L.CHOICE)]
 check("every choice control has choices with words",
       all(f["choices"] and all(c[1] for c in f["choices"]) for f in _choice))
-_ms = next(f for _g, f in _flat if f["key"] == "meter_source")
+_ms = field(FIELD, "meter_source")
 check("the meter source is radio cards with a line of help on each",
       _ms["control"] == L.CHOICE and set(_ms["hints"]) == {c[0] for c in
                                                             _ms["choices"]})
-_reg = next(f for _g, f in _flat if f["key"] == "ui.region")
+_reg = field(FIELD, "ui.region")
 check("the region shows its preset year beside the choice (P0 review)",
       ["flanders", "Flanders, Fluvius Antwerpen, 2026 figures", False]
       in _reg["choices"] and _reg["presets"]["flanders"]["year"] == 2026)
@@ -129,14 +131,14 @@ check(f"measured and derived values are locked behind 'Change' "
 check("each group says when its settings apply",
       all(g["applies"] == [UI_TEXT["applies"]["restart"]["name"]]
           for g in LAYOUT["groups"]))
-_inv = next(f for _g, f in _flat if f["key"] == "inverters")
+_inv = field(FIELD, "inverters")
 check("the inverter cards carry their count, and adding one makes a list",
       _inv["count"] == U.COUNT and _inv["grow"] == U.GROWN
       and [s["key"] for s in _inv["fields"]]
       == [f.key for f in L.ROSTER_FIELDS])
 check("a page-only field names the option keys it writes, for the grey key "
       "line", _reg["writes"] == ["price_taxes_profile"]
-      and next(f for _g, f in _flat if f["key"] == "ui.solar")["writes"]
+      and field(FIELD, "ui.solar")["writes"]
       == ["pv_entities", "pv_entity", "pv_invert_entities"])
 check("without a Supervisor schema the page still draws, with no ranges",
       len(uipage.layout([], {})["groups"]) == 6)