[SOLVED] UNQ_SALES_FLAT_ORDER_INCREMENT_ID in Magento

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The error “UNQ_SALES_FLAT_ORDER_INCREMENT_ID” is usually seen when magento uses alphanumeric order numbers. When the old customer buys a product again, magento instead of increasing the ordre increment from the latest order, increases the increment from the last order of the same old customer. This creates a duplicate entry and magento refuses to take an order.

You can also receive an email containing “SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry ‘AB100082765’ for key ‘UNQ_SALES_FLAT_ORDER_INCREMENT_ID‘” error or “There was an error processing your request” during placing an order.

There is an easy fix to this problem. It requires a core modification of a code which can be done if you have access to ftp credentials. It cannot be performed from backend.

[alert variation=”alert-error”]BACKUP YOUR DATABASE FIRST. I’M NOT RESPONSIBLE FOR ANYTHING THAT HAPPENS WITH THE FOLLOWING PROCESS. USE IT AT YOUR OWN RISK[/alert]

Open the ftp channel and Go to

app/code/core/Mage/Sales/Model/Resource/Quote.php

Find:

 isOrderIncrementIdUsed

There at its bottom you will find a line and you will have to replace it with another code (just remove a part of code)

Replace

$bind      = array(':increment_id' => (int)$orderIncrementId); 

with

$bind      = array(':increment_id' => $orderIncrementId); 

Save it.

[signoff icon=”icon-thumbs-up”]Now the alphanumeric order will start working again.[/signoff]