diff --git a/core/tests/trading/test_assetfilter.py b/core/tests/trading/test_assetfilter.py
index dcbdcad..d610d0b 100644
--- a/core/tests/trading/test_assetfilter.py
+++ b/core/tests/trading/test_assetfilter.py
@@ -16,16 +16,55 @@ class AssetfilterTestCase(TestCase):
             description="Test group",
         )
 
-    def test_get_allowed(self):
+    def test_get_allowed_negative(self):
         """
-        Test that the asset filter works.
+        Test that the asset filter works on negative aggregations.
         """
-        self.group.allowed = {"EUR_USD": True, "EUR_GBP": False}
-        self.assertTrue(assetfilter.get_allowed(self.group, "EUR_USD", "buy"))
-        self.assertFalse(assetfilter.get_allowed(self.group, "EUR_GBP", "sell"))
+        # We have negative news about EUR
+        self.group.allowed = {"EUR": False}
+        self.group.save()
 
-        # Default true
-        self.assertTrue(assetfilter.get_allowed(self.group, "nonexistent", "sell"))
+        # This means that:
+        # * base == EUR: long is not allowed, short is allowed
+        # * quote == EUR: long is allowed, short is not allowed
+        # We are betting on it going down, so we short base, and long quote.
+
+        # Test that short on base of EUR is allowed
+        self.assertTrue(assetfilter.get_allowed(self.group, "EUR", "USD", "short"))
+
+        # Test that long on quote of EUR is allowed
+        self.assertTrue(assetfilter.get_allowed(self.group, "USD", "EUR", "long"))
+
+        # Test that long on base of EUR is not allowed
+        self.assertFalse(assetfilter.get_allowed(self.group, "EUR", "USD", "long"))
+
+        # Test that short on quote of EUR is not allowed
+        self.assertFalse(assetfilter.get_allowed(self.group, "USD", "EUR", "short"))
+
+    def test_get_allowed_positive(self):
+        """
+        Test that the asset filter works on positive aggregations.
+        """
+        # We have positive news about EUR
+        self.group.allowed = {"EUR": True}
+        self.group.save()
+
+        # This means that:
+        # * base == EUR: long is allowed, short is not allowed
+        # * quote == EUR: long is not allowed, short is allowed
+        # We are betting on it going up, so we long base, and short quote.
+
+        # Test that long on base of EUR is allowed
+        self.assertTrue(assetfilter.get_allowed(self.group, "EUR", "USD", "long"))
+
+        # Test that short on quote of EUR is allowed
+        self.assertTrue(assetfilter.get_allowed(self.group, "USD", "EUR", "short"))
+
+        # Test that short on base of EUR is not allowed
+        self.assertFalse(assetfilter.get_allowed(self.group, "EUR", "USD", "short"))
+
+        # Test that long on quote of EUR is not allowed
+        self.assertFalse(assetfilter.get_allowed(self.group, "USD", "EUR", "long"))
 
     def test_check_asset_aggregation(self):
         """
diff --git a/core/trading/assetfilter.py b/core/trading/assetfilter.py
index db77667..1cdbee3 100644
--- a/core/trading/assetfilter.py
+++ b/core/trading/assetfilter.py
@@ -1,22 +1,44 @@
-def get_allowed(group, symbol, direction):
+def get_allowed(group, base, quote, direction):
     """
-    Determine whether the trade is allowed according to the Asset Groups
-    linked to the strategy.
+    Determine whether the trade is allowed according to the group.
+    See tests for examples. The logic requires trading knowledge.
+    :param group: The group to check
+    :param base: The base currency
+    :param quote: The quote currency
+    :param direction: The direction of the trade
     """
-    # TODO: figure out what to do with direction
 
     allowed = group.allowed
     if not isinstance(allowed, dict):
         return False
-    if symbol not in allowed:
-        return True
 
-    return allowed[symbol]
+    # If our base has allowed == False, we can only short it, or long the quote
+    if base in allowed:
+        if not allowed[base]:
+            if direction == "long":
+                return False
+        else:
+            if direction == "short":
+                return False
+
+    # If our quote has allowed == False, we can only long it, or short the base
+    if quote in allowed:
+        if not allowed[quote]:
+            if direction == "short":
+                return False
+        else:
+            if direction == "long":
+                return False
+
+    return True
 
 
 def check_asset_aggregation(value, trigger_above, trigger_below):
     """
-    Check if the value is within the bounds of the aggregation
+    Check if the value is within the bounds of the aggregation.
+    :param value: The value to check
+    :param trigger_above: Only trigger if the value is above this
+    :param trigger_below: Only trigger if the value is below this
     """
     # If both are defined
     if trigger_above is not None and trigger_below is not None:
diff --git a/core/trading/crossfilter.py b/core/trading/crossfilter.py
index 8e3006a..12428bd 100644
--- a/core/trading/crossfilter.py
+++ b/core/trading/crossfilter.py
@@ -63,6 +63,22 @@ def check_conflicting_position(
     new_symbol: str,
     trade_side_opposite: str,
 ):
+    """
+    Determine if we have a conflicting position open.
+    :param func: Whether we are checking entries, exits or trends
+    :param position: Position dict
+    :param open_base: Base currency of the open position
+    :param open_quote: Quote currency of the open position
+    :param open_side: Side of the open position
+    :param open_symbol: Symbol of the open position
+    :param open_units: Units of the open position
+    :param new_base: Base currency of the new position
+    :param new_quote: Quote currency of the new position
+    :param new_side: Side of the new position
+    :param new_symbol: Symbol of the new position
+    :param trade_side_opposite: Opposite side of the trade
+    :return: dict of action and opposing position, or None
+    """
     if open_base == new_quote or open_quote == new_base:
         # If we have a long on GBP/AUD, we can only place shorts on XAU/GBP.
         if open_side != trade_side_opposite:
@@ -85,10 +101,10 @@ def crossfilter(account, new_symbol, new_direction, func):
     Checks open positions for the account, rejecting the trade if there is one
     with an opposite direction to this one.
     :param account: Account object
-    :param symbol: Symbol
-    :param direction: Direction of the trade
-    :param func: Whether we are checking entries or exits
-    :return: dict of action and opposing position, or False
+    :param new_symbol: Symbol of the new position
+    :param new_direction: Direction of the new position
+    :param func: Whether we are checking entries, exits or trends
+    :return: dict of action and opposing position, False or None
     """
     try:
         # Only get the data we need
diff --git a/core/trading/market.py b/core/trading/market.py
index e39d7f7..3b943e8 100644
--- a/core/trading/market.py
+++ b/core/trading/market.py
@@ -329,7 +329,7 @@ def execute_strategy(callback, strategy, func):
 
     # Check against the asset groups
     if func == "entry" and strategy.assetgroup is not None:
-        allowed = assetfilter.get_allowed(strategy, symbol, direction)
+        allowed = assetfilter.get_allowed(strategy, base, quote, direction)
         if not allowed:
             log.debug(
                 f"Denied trading {symbol} due to asset filter {strategy.assetgroup}"