Checkbox don't save in database with Symfony 1.4

I try to save a checked value to save in database with my rebuilded html form (i had no choice to do that)

With the first input everything going well, i can update and save to database

> <input maxlength="4" size="20" type="text"
> name="appel_projet[ConfigurationAp][<?php echo $i ?>][annee_cap]"
> value="<?php echo $champs['annee_cap'] ?>"
> id="appel_projet_ConfigurationAp_<?php echo $i ?>_anne_cap">

but with the checkbox i can save nothing.. where i'm doing wrong ?

 <input type="checkbox" name="appel_projet[ConfigurationAp][<?php echo $i ?>][budget_mission_cap]" id="<?php echo $i ?>_budget_mission_cap" value="<?php echo $champs['budget_mission_cap']?>" <?php echo ($champs['budget_mission_cap']== 1 ? 'checked' : '');?>>

Hope someone could help me with the checkbox

Here a part of my form :

<table>
          <tbody>
            <?php foreach($form[$name]->getValue() as $i => $champs): ?>
              <tr>
                <th><?php echo $champs['annee_cap'] ?></th>
                <td>

                  <table>
                    <tbody>
                      <tr>
                        <th>
                          <label for="appel_projet_ConfigurationAp_<?php echo $i ?>_anne_cap">Année</label>
                        </th>
                        <td>
                          <input maxlength="4" size="20" type="text" name="appel_projet[ConfigurationAp][<?php echo $i ?>][annee_cap]" value="<?php echo $champs['annee_cap'] ?>" id="appel_projet_ConfigurationAp_<?php echo $i ?>_anne_cap">
                        </td>
                      </tr>
                      <tr>
                        <th>
                          <label for="appel_projet_ConfigurationAp_<?php echo $i ?>_budget_mission_cap">Mission</label>
                        </th>
                        <td>
                          <input type="checkbox" name="appel_projet[ConfigurationAp][<?php echo $i ?>][budget_mission_cap]" id="<?php echo $i ?>_budget_mission_cap" value="<?php echo $champs['budget_mission_cap']?>" <?php echo ($champs['budget_mission_cap']== 1 ? 'checked' : '');?>>
                        </td>
                      </tr>