Update

libraries/jcb_powers/JCB.Joomla/src/Subformpower/Table.php

@@ -159,17 +159,17 @@ final class Table extends BaseTable implements Tableinterface
 			],
 		],
 		'currency' => [
-			'name' => [
-				'name' => 'name',
-				'label' => 'COM_SUBFORMPOWER_CURRENCY_NAME_LABEL',
-				'type' => 'text',
+			'ext_number' => [
+				'name' => 'ext_number',
+				'label' => 'COM_SUBFORMPOWER_CURRENCY_EXT_NUMBER_LABEL',
+				'type' => 'number',
 				'title' => true,
 				'list' => 'currencies',
 				'store' => NULL,
 				'tab_name' => 'Details',
 				'db' => [
-					'type' => 'VARCHAR(255)',
-					'default' => '',
+					'type' => 'INT(10)',
+					'default' => '0',
 					'null_switch' => 'NOT NULL',
 					'unique_key' => false,
 					'key' => true,