Change Invoice Number

This tool allows You to manually enter and override invoice number
use in admin=>sales=>orders=>view=>order details tab.

based on this plugin: 
http://www.opencart.com/index.php?route=extension/extension/info&extension_id=21247

Tested with OC 1.5.3.1 by me after modify and fix bug

Tested with OC 1.5.6.1. Uses VQMod by author original

See screenshots and feel free to comment if you have any questions.

Technically this module is allows you to change invoice prefix and invoice no after invoice is generated.


----------------------------------changes---------------------------------------------

you can also remove the two input field to remove the invoice incorrect. 
^<= NOT TURE! =>^

Correction: 
Just remove invoice no but leave the prefix.

Reason:
If we remove also the prefix, it will cause a probleme.
When we recreate a invoice for this product, if has no prefix, but just make a number like "1" "2" "3".