Selenium checkbox data driven - Checkbox has only target but no value - selenium

Question

Im having difficulties parameterizing (data driven) checkboxes using Selenium IDE. When I record selecting a checkbox using Selenium i get the following action:
<tr>
<td>click</td>
<td>id=_ctl0_MainContentPlaceHolder_UseCaseBesturing__ctl1_dgOndersteundeChannels__ctl2_chkbxChannel</td>
<td></td>
In order to parameterize this action and pointing to my test data (XML) file I need a value which I can set as a variable. But in this action there is no value, only a target which is the ID.
Any ideas how to parameterize this action or how to check the checkbox using a value instead of using only the target (ID)?
P.S. Text fields work fine by putting "${Parametername}" in value field in Selenium for an action. The Parametername will then be my column name in my test data file.
Html code of the checkboxes:
<table class="detailgrid" cellspacing="0" border="0" id="_ctl0_MainContentPlaceHolder_UseCaseBesturing__ctl1_dgOndersteundeChannels" style="border-style:None;border-collapse:collapse;">
<tbody><tr>
<td style="width:20px;">
<span disabled="disabled"><input id="_ctl0_MainContentPlaceHolder_UseCaseBesturing__ctl1_dgOndersteundeChannels__ctl2_chkbxChannel" type="checkbox" name="_ctl0:MainContentPlaceHolder:UseCaseBesturing:_ctl1:dgOndersteundeChannels:_ctl2:chkbxChannel" checked="checked" disabled="disabled"></span>
</td><td>
<span id="_ctl0_MainContentPlaceHolder_UseCaseBesturing__ctl1_dgOndersteundeChannels__ctl2_lblChannelNaam">POS</span>
</td>
</tr><tr>
<td style="width:20px;">
<input id="_ctl0_MainContentPlaceHolder_UseCaseBesturing__ctl1_dgOndersteundeChannels__ctl3_chkbxChannel" type="checkbox" name="_ctl0:MainContentPlaceHolder:UseCaseBesturing:_ctl1:dgOndersteundeChannels:_ctl3:chkbxChannel">
</td><td>
<span id="_ctl0_MainContentPlaceHolder_UseCaseBesturing__ctl1_dgOndersteundeChannels__ctl3_lblChannelNaam">eCommerce</span>
</td>
</tr><tr>
<td>
<br>
<span type="checkbox"><input id="_ctl0_MainContentPlaceHolder_UseCaseBesturing__ctl1_dgOndersteundeChannels__ctl4_chkalles1" type="checkbox" name="_ctl0:MainContentPlaceHolder:UseCaseBesturing:_ctl1:dgOndersteundeChannels:_ctl4:chkalles1" onclick="CheckAll('chkbxChannel', this.checked);"></span>
</td><td>
<br>
Alles Aan
</td>
</tr>
</tbody></table>

Answer 1

Still use a click but change how you find the target by using xpath.
It would look something like this:
Target:
xpath=//td/span[text()='POS']
Hope this helps!

Answer 2

After going through the question, I tried using parameter for Target in the test step( as it was not possible to parameterize Action(Command) after various attempts) in Selenium IDE.
To select a checkbox the Xpath should point to the input tag and can be checked using click command.
IMO, as per the HTML, the correct Xpath for checking the checkbox corresponding to eCommerce should be :
//span[text()='eCommerce']/ancestor::td/preceding-sibling::td/input