fix: Correctly choose the existing price ID when editing variant prices (#7894)

packages/admin-next/dashboard/src/routes/products/product-prices/pricing-edit.tsx

@@ -93,7 +93,9 @@ export const PricingEdit = ({
               )?.id
             } else {
               existingId = variants[ind].prices.find(
-                (p) => p.currency_code === currencyCode
+                (p) =>
+                  p.currency_code === currencyCode &&
+                  Object.keys(p.rules ?? {}).length === 0
               )?.id
             }
 
@@ -103,7 +105,6 @@ export const PricingEdit = ({
               ? {
                   id: existingId,
                   amount,
-                  currency_code: currencyCode,
                 }
               : { currency_code: currencyCode, amount }