diff --git a/FS25_ADSmartPickup/adBuildings.lua b/FS25_ADSmartPickup/adBuildings.lua
index 114a28d..85b2b85 100644
--- a/FS25_ADSmartPickup/adBuildings.lua
+++ b/FS25_ADSmartPickup/adBuildings.lua
@@ -231,13 +231,17 @@ local function build(adEnv, farmId)
                     end
                     table.sort(loadMarkers, function(a, b) return ADBuildings.naturalLess(a.name, b.name) end)
                 end
+                local unloadMarker = nearestMarker(adEnv, unloadNodes)
+                -- silo der kun kan FYLDES (fx drive-on-bunker der fodrer en biogas-fermentor): aflæsning,
+                -- ingen læssestation -> et forsyningsmål, aldrig en kilde
+                local isFillOnlySilo = kind == "silo" and loadMarkers[1] == nil and #loadGroups == 0 and unloadMarker ~= nil
                 table.insert(result, {
                     id = id, name = getName(placeable, id), kind = kind, placeable = placeable,
                     loadMarker = loadMarkers[1],
                     loadMarkers = loadMarkers,
-                    unloadMarker = nearestMarker(adEnv, unloadNodes),
-                    canBeSource = kind ~= "sell",
-                    canBeTarget = kind == "husbandry" or kind == "factory",
+                    unloadMarker = unloadMarker,
+                    canBeSource = kind ~= "sell" and not isFillOnlySilo,
+                    canBeTarget = kind == "husbandry" or kind == "factory" or isFillOnlySilo,
                     canSell = kind == "sell",
                 })
             end
diff --git a/FS25_ADSmartPickup/modDesc.xml b/FS25_ADSmartPickup/modDesc.xml
index cf71c4f..91781bc 100644
--- a/FS25_ADSmartPickup/modDesc.xml
+++ b/FS25_ADSmartPickup/modDesc.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8" standalone="no"?>
 <modDesc descVersion="107">
     <author>masterdraco</author>
-    <version>1.18.0.0</version>
+    <version>1.18.1.0</version>
     <title>
         <en>AD Smart Pickup</en>
     </title>
diff --git a/docs/BRUGERMANUAL.md b/docs/BRUGERMANUAL.md
index e4fdcf2..05348b6 100644
--- a/docs/BRUGERMANUAL.md
+++ b/docs/BRUGERMANUAL.md
@@ -1,6 +1,6 @@
 # AD Smart Pickup — brugermanual
 
-Version 1.18.0 · Farming Simulator 25 · tillæg til AutoDrive
+Version 1.18.1 · Farming Simulator 25 · tillæg til AutoDrive
 
 *English version: [USER_MANUAL.md](USER_MANUAL.md)*
 
@@ -179,7 +179,9 @@ Et forsyningsflow holder én eller flere bygninger fyldt med alt det, de bruger.
 ### Opsætning
 
 1. **Nyt run**, og lad Retning stå på **Ind til bygning**.
-2. Under **Til**: sæt Ja ud for de stalde og fabrikker, der skal fyldes.
+2. Under **Til**: sæt Ja ud for de stalde og fabrikker, der skal fyldes. Listen viser også siloer,
+   der kun kan fyldes og ikke tømmes, fx Pumps & Hoses' drive-on-bunkere (DOB 115), der fodrer en
+   biogas-fermentor. For dem er **Vælg** med de varer, fermentoren skal have, bedst.
 3. Under **Varer**: vælg **Auto** eller **Vælg**.
    - **Auto** henter alt det, bygningen tager. For fabrikker er det inputs til de produktioner,
      der er tændt.
diff --git a/docs/USER_MANUAL.md b/docs/USER_MANUAL.md
index cba1d69..e7ed895 100644
--- a/docs/USER_MANUAL.md
+++ b/docs/USER_MANUAL.md
@@ -1,6 +1,6 @@
 # AD Smart Pickup — user manual
 
-Version 1.18.0 · Farming Simulator 25 · add-on for AutoDrive
+Version 1.18.1 · Farming Simulator 25 · add-on for AutoDrive
 
 *Dansk version: [BRUGERMANUAL.md](BRUGERMANUAL.md)*
 
@@ -181,7 +181,9 @@ A supply flow keeps one or more buildings filled with everything they use.
 ### Setup
 
 1. **New run**, and leave Direction on **Into building**.
-2. Under **To**: set Yes on the barns and factories to fill.
+2. Under **To**: set Yes on the barns and factories to fill. The list also shows silos that can only
+   be filled and not emptied, such as the Pumps & Hoses drive-on bunkers (DOB 115) that feed a biogas
+   fermenter. For those, **Select** with the goods the fermenter needs works best.
 3. Under **Goods**: choose **Auto** or **Select**.
    - **Auto** fetches everything the building accepts. For factories, that is the inputs of the
      productions that are switched on.
diff --git a/tests/test_adBuildings.lua b/tests/test_adBuildings.lua
index a0a41c8..537f98e 100644
--- a/tests/test_adBuildings.lua
+++ b/tests/test_adBuildings.lua
@@ -135,5 +135,19 @@ check("B6 naturlig sortering", ADBuildings.naturalLess("Silo 9", "Silo 10"), tru
 check("B6 naturlig sortering, tal før tekst-lighed", ADBuildings.naturalLess("25 Silo Storage", "26 Silo Storage"), true)
 check("B6 naturlig sortering ens navn -> markørnavn", ADBuildings.compare({name = "Farma", loadMarkers = {{name = "30 Silo"}}}, {name = "Farma", loadMarkers = {{name = "4 Silo"}}}), false)
 
+-- B-DOB: silo der kun kan FYLDES (drive-on-bunker ved biogas: aflæsning, ingen læssestation) = mål, ikke kilde
+do
+    local dob = placeable("dob1", "DOB 115", 5000, 0, {spec_silo = {}})
+    table.insert(unloadStations, {owningPlaceable = dob, unloadTriggers = {{exactFillRootNode = {x = 5000, z = 5}}}})
+    addMarker(21, "Biogas Drop 1", "Biogas", 5000, 12)
+    ADBuildings.invalidate()
+    local byIdDob = {}
+    for _, b in ipairs(ADBuildings.list(adEnv, 1)) do byIdDob[b.id] = b end
+    check("B-DOB kan være mål", byIdDob.dob1.canBeTarget, true)
+    check("B-DOB ikke kilde (intet at hente)", byIdDob.dob1.canBeSource, false)
+    check("B-DOB aflæsningsmarkør", byIdDob.dob1.unloadMarker.id, 21)
+    check("B-DOB almindelig silo stadig ikke mål", byIdDob.silo1.canBeTarget, false)
+end
+
 print(failures == 0 and "\nALLE TESTS OK" or ("\n" .. failures .. " FEJL"))
 os.exit(failures == 0 and 0 or 1)