Magento to increase return, replacement RMA function

One: For return SQL installation table data, required fields

<?php

$installer = $this;
$installer->startsetup ();
$installer->run ("

DROP TABLE IF EXISTS ' Return_order ';

CREATE TABLE ' Return_order ' (
' return_id ' int (a) unsigned not NULL auto_increment COMMENT ' return request ID ',
' customer_id ' int (a) unsigned not NULL COMMENT ' applicant ID ',
' order_id ' int (a) unsigned not NULL COMMENT ' order ID ',
' return_total_xyz ' int (a) unsigned not NULL COMMENT ' refunded total mind value ',
' return_shipping_number ' varchar DEFAULT NULL COMMENT ' return logistics number ',
' auditor_id ' int (a) unsigned not NULL COMMENT ' approver ID ',
' confirm_user_id ' int (a) unsigned not NULL COMMENT ' confirm consignee id ',
' Return_shipping_name ' text COMMENT ' logistics name ',
' Return_status ' enum (' return_agreement ', ' return_refuse ', ' return_confirm ') DEFAULT NULL COMMENT ' return_agreement: Agree to return the goods; Return_refuse: Refuse to return; Return_confirm: Confirm Receipt ',
' Return_create_time ' datetime DEFAULT NULL COMMENT ' Application Time ',
' Product_recieve_time ' datetime DEFAULT NULL COMMENT ' Receipt time ',
' Return_deal_time ' datetime DEFAULT NULL COMMENT ' process application time ',
' Return_memo ' text COMMENT ' return instructions ',
PRIMARY KEY (' return_id '),
KEY ' customer_id ' (' customer_id '),
KEY ' order_id ' (' order_id ')
) Engine=innodb DEFAULT Charset=utf8;

/*table structure for Table ' return_order_item ' *

DROP TABLE IF EXISTS ' Return_order_item ';

CREATE TABLE ' Return_order_item ' (
' return_item_id ' int (a) unsigned not NULL auto_increment,
' return_order_id ' int (a) unsigned not NULL COMMENT ' return order ID ',
' customer_id ' int (a) unsigned not NULL COMMENT ' return Person ID ',
' sales_order_id ' int (a) unsigned not NULL COMMENT ' order ID, sales_flat_order table ID ',
' order_item_id ' int (a) unsigned not NULL COMMENT ' sales_flat_order_item table ID ',
' product_id ' int (a) unsigned not NULL COMMENT ' Product ID ',
' Return_qty ' int (a) unsigned not NULL COMMENT ' number of returned goods ',
' return_item_xyz ' int (a) unsigned not NULL COMMENT ' returned mind value ',
PRIMARY KEY (' return_item_id '),
KEY ' return_order_item_ibfk_2 ' (' return_order_id '),
CONSTRAINT ' return_order_item_ibfk_2 ' FOREIGN KEY (' return_order_id ') REFERENCES ' Sales_flat_order ' (' entity_id ') on DELETE CASCADE on UPDATE CASCADE
) Engine=innodb DEFAULT Charset=utf8;

");
$installer->endsetup ();

Second: for replacement

<?php

$installer = $this;
$installer->startsetup ();
$installer->run ("

DROP TABLE IF EXISTS ' Barter_items ';

CREATE TABLE ' Barter_items ' (
' barter_item_id ' int (a) unsigned not NULL auto_increment,
' barter_id ' int (a) unsigned not NULL COMMENT ' Exchange slip ID ',
' sales_item_id ' int (a) unsigned not NULL COMMENT ' sales_flat_order_item table ID ',
' customer_id ' int (a) unsigned not NULL COMMENT ' replacement id ',
' product_id ' int (a) unsigned not NULL COMMENT ' Product ID ',
' Barter_qty ' int (a) unsigned not NULL COMMENT ' replacement quantity ',
PRIMARY KEY (' barter_item_id ')
) Engine=innodb DEFAULT Charset=utf8;

/*table structure for Table ' barter_order ' *

DROP TABLE IF EXISTS ' Barter_order ';

CREATE TABLE ' Barter_order ' (
' barter_id ' int (a) unsigned not NULL auto_increment COMMENT ' Exchange slip ID ',
' customer_id ' int (a) unsigned not NULL COMMENT ' applicant ID ',
' order_id ' int (a) unsigned not NULL COMMENT ' sales order ID ',
' Barter_apply_time ' datetime COMMENT ' replacement application time ',
' Barter_check_time ' datetime COMMENT ' replacement application approval time ',
' Customer_delivery_time ' datetime COMMENT ' customer delivery time ',
' customer_express_name ' varchar not NULL COMMENT ' customer shipping logistics name ',
' customer_express_num ' varchar not NULL COMMENT ' customer dispatch logistics number ',
' Warehouse_receive_time ' datetime COMMENT ' warehouse receipt time ',
' Warehouse_delivery_time ' datetime COMMENT ' warehouse delivery time ',
' warehouse_express_name ' varchar not NULL COMMENT ' warehouse shipping logistics name ',
' warehouse_express_num ' varchar not NULL COMMENT ' warehouse shipping number ',
' Customer_receive_time ' datetime COMMENT ' customer confirms receipt time ',
' Barter_status ' enum (' barter_agreenment ', ' barter_refuse ', ' warehouse_recieved ', ' warehouse_delivery ', ' CUSTOMER_ Recieved ')
DEFAULT NULL COMMENT ' barter_agreenment: Agreed to exchange, Barter_refuse: refused to receive replacement, Warehouse_recieved: Warehouse confirmation Receipt, Warehouse_delivery: Warehouse has been issued , customer_recieved: The customer confirms the receipt ',
' Barter_memo ' text COMMENT ' return instructions ',
PRIMARY KEY (' barter_id ')
) Engine=innodb DEFAULT Charset=utf8;

");
$installer->endsetup ();