diff --git a/rattail_corepos/corepos/importing/db/exporters/catapult_inventory.py b/rattail_corepos/corepos/importing/db/exporters/catapult_inventory.py
index f3848ad..c2d39fc 100644
--- a/rattail_corepos/corepos/importing/db/exporters/catapult_inventory.py
+++ b/rattail_corepos/corepos/importing/db/exporters/catapult_inventory.py
@@ -128,6 +128,10 @@ class InventoryItemImporter(FromCore, catapult_importing.model.InventoryItemImpo
             'corepos', 'exporting.catapult_inventory.warn_missing_department',
             default=True)
 
+        self.warn_empty_subdepartment = self.config.getbool(
+            'corepos', 'exporting.catapult_inventory.warn_empty_subdepartment',
+            default=True)
+
         self.warn_truncated_receipt_alias = self.config.getbool(
             'corepos', 'exporting.catapult_inventory.warn_truncated_receipt_alias',
             default=True)
@@ -367,6 +371,16 @@ class InventoryItemImporter(FromCore, catapult_importing.model.InventoryItemImpo
             else:
                 supplier_unit = 'CS'
 
+        pf1 = None
+        if product.subdepartment:
+            if not product.subdepartment.number:
+                logger = log.warning if self.warn_empty_subdepartment else log.debug
+                logger("product %s has 'empty' subdepartment number: %s",
+                       product.upc, product)
+            else:
+                pf1 = "{} {}".format(product.subdepartment.number,
+                                     product.subdepartment.name)
+
         memo = None
         if product.user_info and product.user_info.long_text is not None:
             memo = str(product.user_info.long_text)
@@ -439,7 +453,7 @@ class InventoryItemImporter(FromCore, catapult_importing.model.InventoryItemImpo
             # 'cs_pk_multiplier': None,
             # 'dsd': None,
 
-            'pf1': product.subdepartment.number if product.subdepartment else None,
+            'pf1': pf1,
 
             # TODO: are these needed?
             # 'pf2',