feat: use int for billing frequency
diff --git a/erpnext/non_profit/doctype/membership_settings/membership_settings.json b/erpnext/non_profit/doctype/membership_settings/membership_settings.json
index ce843b3..56b8eac 100644
--- a/erpnext/non_profit/doctype/membership_settings/membership_settings.json
+++ b/erpnext/non_profit/doctype/membership_settings/membership_settings.json
@@ -32,7 +32,7 @@
   {
    "description": "The number of billing cycles for which the customer should be charged. For example, if a customer is buying a 1-year membership that should be billed on a monthly basis, this value should be 12.",
    "fieldname": "billing_frequency",
-   "fieldtype": "Data",
+   "fieldtype": "Int",
    "label": "Billing Frequency"
   }
  ],