diff --git a/pricing/pricing.py b/pricing/pricing.py
index f7d7161..e6cf2e5 100644
--- a/pricing/pricing.py
+++ b/pricing/pricing.py
@@ -375,6 +375,7 @@ order by b.enabled_date desc"""
 			e = Exception(f'config_data is None, {yamlstr=}')
 			exception(f'{e=}')
 			raise e
+		config_data = config_data.copy()
 		d = None
 		try:
 			d = yaml.safe_load(yamlstr)
@@ -388,7 +389,6 @@ order by b.enabled_date desc"""
 		if not d.pricings:
 			exception(f'{d} has not "pricings"')
 			raise Exception(f'定价定义中没有pricing数据')
-		formula = d.formula
 		ret_items = []
 		for i, p in enumerate(d.pricings):
 			if not p.formula: