added comment about design mode

Author: evereux

examples/example__bom_custom_001.py

@@ -25,13 +25,17 @@
 from datetime import datetime
 
 from pycatia import catia
+from pycatia.enumeration.enumeration_types import cat_work_mode_type
 from pycatia.product_structure_interfaces.product_document import ProductDocument
 
 application = catia()
 product_document: ProductDocument = application.active_document
 product = product_document.product
 products = product.products
 
+# if the product isn't already in design mode you'll need to activate it, otherwise script will fail.
+product.apply_work_mode(cat_work_mode_type.index("DESIGN_MODE"))
+
 part_numbers = []
 prd_dict = {}