diff --git a/specifyweb/frontend/js_src/lib/components/WbPlanView/navigator.ts b/specifyweb/frontend/js_src/lib/components/WbPlanView/navigator.ts
index 782d3ca87fe..fdcc81cb4e9 100644
--- a/specifyweb/frontend/js_src/lib/components/WbPlanView/navigator.ts
+++ b/specifyweb/frontend/js_src/lib/components/WbPlanView/navigator.ts
@@ -177,7 +177,7 @@ export type MappingLineData = Pick<
   readonly defaultValue: string;
 };
 
-const queryBuilderTreeFields = new Set(['fullName', 'author']);
+const queryBuilderTreeFields = new Set(['fullName', 'author', 'groupNumber']);
 
 /**
  * Get data required to build a mapping line from a source mapping path
diff --git a/specifyweb/stored_queries/queryfieldspec.py b/specifyweb/stored_queries/queryfieldspec.py
index ed4824d84c3..e92d47f92fa 100644
--- a/specifyweb/stored_queries/queryfieldspec.py
+++ b/specifyweb/stored_queries/queryfieldspec.py
@@ -22,7 +22,7 @@
 DATE_PART_RE = re.compile(r'(.*)((NumericDay)|(NumericMonth)|(NumericYear))$')
 
 # Pull out author or groupnumber field from taxon query fields.
-TAXON_FIELD_RE = re.compile(r'(.*) ((Author)|(GroupNumber))$')
+TAXON_FIELD_RE = re.compile(r'(.*) ((Author)|(groupNumber))$')
 
 # Look to see if we are dealing with a tree node ID.
 TREE_ID_FIELD_RE = re.compile(r'(.*) (ID)$')