diff --git a/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/clean/InputCleanHandler.java b/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/clean/InputCleanHandler.java
index 82071f4c6..afc71033e 100644
--- a/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/clean/InputCleanHandler.java
+++ b/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/clean/InputCleanHandler.java
@@ -44,6 +44,10 @@ static void error(String translationKey) {
     static <T extends AbstractContainerMenu> void returnSlotsToPlayerInventory(MenuInfoContext<T, ?, ?> context, DumpHandler<T, ?> dumpHandler, SlotAccessor slotAccessor) {
         ItemStack stackToReturn = slotAccessor.getItemStack();
         if (!stackToReturn.isEmpty()) {
+            if (!slotAccessor.allowModification(context.getPlayerEntity())) {
+                error("rei.rei.no.slot.in.inv");
+            }
+            
             for (; !(stackToReturn = slotAccessor.getItemStack()).isEmpty(); slotAccessor.takeStack(1)) {
                 ItemStack stackToInsert = stackToReturn.copy();
                 stackToInsert.setCount(1);
diff --git a/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/simple/DumpHandler.java b/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/simple/DumpHandler.java
index 222651b79..ab6a523d1 100644
--- a/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/simple/DumpHandler.java
+++ b/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/simple/DumpHandler.java
@@ -36,7 +36,7 @@ public interface DumpHandler<T extends AbstractContainerMenu, D extends Display>
     
     static SlotAccessor getOccupiedSlotWithRoomForStack(ItemStack stack, Iterable<SlotAccessor> inventoryStacks) {
         for (SlotAccessor inventoryStack : inventoryStacks) {
-            if (canStackAddMore(inventoryStack.getItemStack(), stack)) {
+            if (canStackAddMore(inventoryStack.getItemStack(), stack) && inventoryStack.canPlace(stack)) {
                 return inventoryStack;
             }
         }
diff --git a/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/stack/ContainerSlotAccessor.java b/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/stack/ContainerSlotAccessor.java
index b2ff12a3e..467c4b06e 100644
--- a/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/stack/ContainerSlotAccessor.java
+++ b/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/stack/ContainerSlotAccessor.java
@@ -24,6 +24,7 @@
 package me.shedaniel.rei.api.common.transfer.info.stack;
 
 import net.minecraft.world.Container;
+import net.minecraft.world.entity.player.Player;
 import net.minecraft.world.item.ItemStack;
 
 /**
@@ -53,4 +54,14 @@ public void setItemStack(ItemStack stack) {
     public ItemStack takeStack(int amount) {
         return this.container.removeItem(index, amount);
     }
+    
+    @Override
+    public boolean allowModification(Player player) {
+        return canPlace(getItemStack());
+    }
+    
+    @Override
+    public boolean canPlace(ItemStack stack) {
+        return this.container.canPlaceItem(index, stack);
+    }
 }
diff --git a/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/stack/SlotAccessor.java b/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/stack/SlotAccessor.java
index 79513fe40..f2dd1c4e5 100644
--- a/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/stack/SlotAccessor.java
+++ b/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/stack/SlotAccessor.java
@@ -41,6 +41,14 @@ public interface SlotAccessor {
     
     ItemStack takeStack(int amount);
     
+    default boolean allowModification(Player player) {
+        return true;
+    }
+    
+    default boolean canPlace(ItemStack stack) {
+        return true;
+    }
+    
     static SlotAccessor fromSlot(Slot slot) {
         return new VanillaSlotAccessor(slot);
     }
diff --git a/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/stack/VanillaSlotAccessor.java b/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/stack/VanillaSlotAccessor.java
index 6e3c97134..579716dea 100644
--- a/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/stack/VanillaSlotAccessor.java
+++ b/api/src/main/java/me/shedaniel/rei/api/common/transfer/info/stack/VanillaSlotAccessor.java
@@ -23,6 +23,7 @@
 
 package me.shedaniel.rei.api.common.transfer.info.stack;
 
+import net.minecraft.world.entity.player.Player;
 import net.minecraft.world.inventory.Slot;
 import net.minecraft.world.item.ItemStack;
 
@@ -54,4 +55,14 @@ public ItemStack takeStack(int amount) {
     public Slot getSlot() {
         return slot;
     }
+    
+    @Override
+    public boolean allowModification(Player player) {
+        return slot.allowModification(player);
+    }
+    
+    @Override
+    public boolean canPlace(ItemStack stack) {
+        return slot.mayPlace(stack);
+    }
 }
diff --git a/runtime/src/main/java/me/shedaniel/rei/impl/common/transfer/InputSlotCrafter.java b/runtime/src/main/java/me/shedaniel/rei/impl/common/transfer/InputSlotCrafter.java
index 7cbf4ebcd..52c8d8503 100644
--- a/runtime/src/main/java/me/shedaniel/rei/impl/common/transfer/InputSlotCrafter.java
+++ b/runtime/src/main/java/me/shedaniel/rei/impl/common/transfer/InputSlotCrafter.java
@@ -117,6 +117,10 @@ protected void fillInputSlot(SlotAccessor slot, ItemStack toBeTakenStack) {
                 }
                 
                 takenStack.setCount(1);
+                if (!slot.canPlace(takenStack)) {
+                    return;
+                }
+                
                 if (slot.getItemStack().isEmpty()) {
                     slot.setItemStack(takenStack);
                 } else {
@@ -148,13 +152,22 @@ protected void fillInputSlots(RecipeFinder recipeFinder, NonNullList<Ingredient>
     
     @Nullable
     public SlotAccessor takeInventoryStack(ItemStack itemStack) {
+        boolean rejectedModification = false;
         for (SlotAccessor inventoryStack : inventoryStacks) {
             ItemStack itemStack1 = inventoryStack.getItemStack();
             if (!itemStack1.isEmpty() && areItemsEqual(itemStack, itemStack1) && !itemStack1.isDamaged() && !itemStack1.isEnchanted() && !itemStack1.hasCustomHoverName()) {
-                return inventoryStack;
+                if (!inventoryStack.allowModification(player)) {
+                    rejectedModification = true;
+                } else {
+                    return inventoryStack;
+                }
             }
         }
         
+        if (rejectedModification) {
+            throw new IllegalStateException("Unable to take item from inventory due to slot not allowing modification! Item requested: " + itemStack);
+        }
+        
         return null;
     }
     
diff --git a/runtime/src/main/java/me/shedaniel/rei/impl/common/transfer/NewInputSlotCrafter.java b/runtime/src/main/java/me/shedaniel/rei/impl/common/transfer/NewInputSlotCrafter.java
index a2d35f24d..36bd20fd2 100644
--- a/runtime/src/main/java/me/shedaniel/rei/impl/common/transfer/NewInputSlotCrafter.java
+++ b/runtime/src/main/java/me/shedaniel/rei/impl/common/transfer/NewInputSlotCrafter.java
@@ -77,6 +77,9 @@ protected void markDirty() {
     protected void cleanInputs() {
         for (SlotAccessor slot : getInputSlots()) {
             ItemStack stackToReturn = slot.getItemStack();
+            if (!slot.allowModification(player)) {
+                throw new IllegalStateException("Slot " + slot + " is not modifiable!");
+            }
             if (!stackToReturn.isEmpty()) {
                 for (; !(stackToReturn = slot.getItemStack()).isEmpty(); slot.takeStack(1)) {
                     ItemStack stackToInsert = stackToReturn.copy();
diff --git a/settings.gradle b/settings.gradle
index 937a949bf..1cbf494f4 100755
--- a/settings.gradle
+++ b/settings.gradle
@@ -2,8 +2,8 @@ pluginManagement {
     repositories {
         maven { url "https://maven.shedaniel.me/" }
         maven { url "https://maven.fabricmc.net/" }
-        maven { url "https://files.minecraftforge.net/maven/" }
         gradlePluginPortal()
+        maven { url "https://files.minecraftforge.net/maven/" }
     }
 }