diff --git a/pricing/pricing.py b/pricing/pricing.py
index c256406..aef3ac1 100644
--- a/pricing/pricing.py
+++ b/pricing/pricing.py
@@ -439,7 +439,7 @@ order by b.enabled_date desc"""
 					raise Exception(e)
 				debug(f'{formula=}, {ns=}, {p=}, {d.fields=}')
 				np.data = config_data
-				np.amount = eval(formula, config_data)
+				np.amount = eval(formula, config_data.copy())
 				ret_items.append(np)
 			else:
 				info(f'{config_data=}, {p=}, {d.model_mappings=}, mismatched')