diff --git a/data.py b/data.py
index 55c4e32d1a..00567724e4 100644
--- a/data.py
+++ b/data.py
@@ -211,7 +211,13 @@ def transform_codelist_mapping_keys(codelist_mapping):
     return codelist_mapping
 
 def create_codelist_mapping(major_version):
-    codelist_mapping = {x['path']:x['codelist'] for x in json.load(open('data/IATI-Codelists-{}/out/clv2/mapping.json'.format(major_version)))}
+    codelist_mapping = {}
+    for x in json.load(open('data/IATI-Codelists-{}/out/clv2/mapping.json'.format(major_version))):
+        if 'condition' in x \
+                and x['path'] in codelist_mapping \
+                and not re.search(r'not\([^)]+\)', x['condition']):
+            continue
+        codelist_mapping[x['path']] = x['codelist']
     return transform_codelist_mapping_keys(codelist_mapping)
 
 MAJOR_VERSIONS = ['2', '1']