This is the function call:

$this -> InvoiceLine -> saveValue($invoiceId, $key, $value);

This is the MODEL:

<?php
class InvoiceLine extends AppModel
{
    var $name                   = 'InvoiceLine';
    var $primaryKey     = 'invoice_line_id';
    var $belongsTo              = array
    (
                'Invoice' => array
        (
                        'className' => 'Invoice',
                        'foreignKey' => 'invoice_id'
                )
        );

    public function saveValue($invoiceId, $key, $value)
    {
                $data = array
                (
                        'Invoice' => array
                        (
                                'invoice_id' => $invoiceId,
                                $key => $value
                        )
                );
                return $this -> save($data);
    }
}

For other models this work fine, only this model gives me problems.

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