diff --git a/mpcdf_common.py b/mpcdf_common.py
index 2a46f4ee2976ff131461caf8ecfaa0255c5ddf01..6fd0fd1e1148ee2eb15da8c6d4f2ce0c9577b551 100644
--- a/mpcdf_common.py
+++ b/mpcdf_common.py
@@ -386,10 +386,22 @@ def get_attribute(api_url, project, package, attribute, with_project=None):
 
 
 def overloaded_project_attribute(api_url, project, attribute):
+    ignore_attribute = attribute.replace("MPCDF:", "MPCDF:ignore_")
+
     try:
-        return get_attribute_values(api_url, project, None, attribute)
+        values = get_attribute_values(api_url, project, None, attribute)
     except UnsetAttributeException:
-        return get_attribute_values(api_url, "software", None, attribute)
+        values = None
+
+    try:
+        ignored = get_attribute_values(api_url, project, None, ignore_attribute)
+    except UnsetAttributeException:
+        ignored = ()
+
+    if values is None:
+        values = get_attribute_values(api_url, "software", None, attribute)
+
+    return list(filter(lambda v: v not in ignored, values))
 
 
 def overloaded_package_attribute(api_url, project, package, attribute):