multiple catalog rules with same price, calculate wrong final price

Question

I have multiple catalog price rules on same product with same price but different priority, so i suppose that system will apply the lowest (0 is lowest) priority rule to calculate final price.

Rule A:

status: active, Priority:0, action: to fixed amount, Discount: 223.200, Stop further rule: Yes

Rule B:

status: active, Priority:1, action: to fixed amount, Discount: 223.200, Stop further rule: yes

So I suppose final price has to be 223.200 by using Rule A. But Final price is coming 223.00.

I have no idea whats happening, can anyone has idea what possibly could be reason of this.

Answer 1

app/code/core/Mage/CatalogRule/Model/Action/Index/Refresh.php, in method _calculatePrice() around line 440:

$byFixed   => $this->_connection->getCheckSql(
                        new Zend_Db_Expr('0 > @price - cppt.action_amount'),
                        new Zend_Db_Expr('0'),
                        new Zend_Db_Expr('@price - cppt.action_amount')
                    ),
                )
            )
        ),
        '@price := @price' // <-- the culprit
    );
} 

replace with:

     $byFixed   => $this->_connection->getCheckSql(
                        new Zend_Db_Expr('0 > @price - cppt.action_amount'),
                        new Zend_Db_Expr('0'),
                        new Zend_Db_Expr('@price - cppt.action_amount')
                    ),
                )
            )
        ),
        '@price' // remove ':= @price' to fix rounding bug
    );
} 

Source