diff --git a/DECISIONS.md b/DECISIONS.md
index 692b870a..616b9ab5 100644
--- a/DECISIONS.md
+++ b/DECISIONS.md
@@ -721,3 +721,5 @@ One line per decision: `[YYYY-MM-DD] <decision>: <why>`. Appended by agents and
 [2026-07-30] The sandbox lock on a paid extension workspace is checked BEFORE the capability gate, and gets its own state (ExtensionSandboxLockState), not the billing upsell. Every new company, sandbox included, gets a 30-day trial grant from the seed_trial trigger, so the paywall waves a demo company straight through onto a workspace whose external services lib/sandbox/guard.ts blocks. And an anonymous demo user has no billing to upgrade: the exit is "Skapa konto", which must sign the anonymous session out first (registering on top of it registers into the sandbox).
 
 [2026-07-31] Seeded chart names corrected to BAS 2026 where the label contradicted what the engine books on the account (7210 'Semesterlöner' -> 'Löner till tjänstemän', 7010, 3001/3002), with an exact-literal + is_system_account backfill so user renames survive. The mislabel class fixed here is "name says X, bookings are Y": payroll books salaries to 7210, 12% revenue books to 3002. The 3100 'Momsfri försäljning' deviation from BAS ('Försäljning av varor utanför Sverige') stays: there the label and the ruta 42 mapping agree by design, so renaming to BAS would create the mismatch, not fix one.
+
+[2026-07-31] Assistant product knowledge REVERTED before merge (founder call): the assistant gets no internal knowledge of Accounted's own features yet. The working product-tier implementation (agent_atom_registry CHECK widening, product/bokforingsmallar atom, discovery, MCP + panel wiring, all CI green at bb65224c) lives in fix/mall-line-type-clarity branch history and a follow-up issue for when it is wanted. Only the UI clarification ships for the radtyp confusion: unified "Kostnad/Intäkt" label and an InfoTooltip explaining the three radtyper at the point of choice.
diff --git a/components/settings/TemplateForm.tsx b/components/settings/TemplateForm.tsx
index 8be5d86b..c0c93c6d 100644
--- a/components/settings/TemplateForm.tsx
+++ b/components/settings/TemplateForm.tsx
@@ -229,7 +229,10 @@ export function TemplateForm({
       </div>
 
       <div>
-        <Label>{t('lines_label')}</Label>
+        <div className="flex items-center gap-1">
+          <Label>{t('lines_label')}</Label>
+          <InfoTooltip content={t('line_types_help')} />
+        </div>
         <div className="space-y-2 mt-1">
           {lines.map((line, i) => {
             const showRatioInput = showRatio && line.type === 'business'
@@ -271,7 +274,7 @@ export function TemplateForm({
                 <Select value={line.type} onValueChange={(v) => updateLineType(i, v as BookingTemplateLibraryLine['type'])}>
                   <SelectTrigger className="flex-1"><SelectValue /></SelectTrigger>
                   <SelectContent>
-                    <SelectItem value="business">{t('type_cost')}</SelectItem>
+                    <SelectItem value="business">{t('type_cost_revenue')}</SelectItem>
                     <SelectItem value="vat">{t('type_vat')}</SelectItem>
                     <SelectItem value="settlement">{t('type_settlement')}</SelectItem>
                   </SelectContent>
diff --git a/messages/en.json b/messages/en.json
index fc176f71..a9dc54d4 100644
--- a/messages/en.json
+++ b/messages/en.json
@@ -1931,7 +1931,6 @@
     "vat_with_rate": "VAT {rate}%",
     "type_settlement": "Payment",
     "type_cost_revenue": "Cost/Revenue",
-    "type_cost": "Cost",
     "type_vat": "VAT",
     "debit_short": "D",
     "credit_short": "C",
@@ -1943,6 +1942,7 @@
     "category_label": "Category",
     "entity_type_label": "Company type",
     "lines_label": "Lines",
+    "line_types_help": "The line type controls how the amount is split, not which account is booked. Payment is the line where the money actually moves (e.g. 1930 business account) and takes the full amount. Cost/Revenue is what the purchase or sale is about (e.g. 5410 or 3011). VAT is calculated automatically from the total. To be selectable directly on a bank transaction, the template needs exactly one cost/revenue line and one payment line on opposite sides.",
     "account_placeholder": "Account",
     "description_short_placeholder": "Description",
     "debit_label": "Debit",
diff --git a/messages/sv.json b/messages/sv.json
index 6903a75f..3746cc00 100644
--- a/messages/sv.json
+++ b/messages/sv.json
@@ -1931,7 +1931,6 @@
     "vat_with_rate": "Moms {rate}%",
     "type_settlement": "Betalning",
     "type_cost_revenue": "Kostnad/Intäkt",
-    "type_cost": "Kostnad",
     "type_vat": "Moms",
     "debit_short": "D",
     "credit_short": "K",
@@ -1943,6 +1942,7 @@
     "category_label": "Kategori",
     "entity_type_label": "Företagstyp",
     "lines_label": "Rader",
+    "line_types_help": "Radtypen styr hur beloppet fördelas, inte vilket konto som bokförs. Betalning är raden där pengarna faktiskt rör sig (t.ex. 1930 Företagskonto) och får hela beloppet. Kostnad/Intäkt är det som köpet eller försäljningen avser (t.ex. 5410 eller 3011). Moms räknas ut automatiskt ur totalbeloppet. För att mallen ska kunna väljas direkt på en banktransaktion krävs exakt en kostnads-/intäktsrad och en betalningsrad på motsatt sida.",
     "account_placeholder": "Konto",
     "description_short_placeholder": "Beskrivning",
     "debit_label": "Debet",