I made a custom object in Salesforce and an associated custom lead field that is a Lookup data type. I'm using a web-to-lead form and altering it to include this custom field (since Salesforce doesn't give you this Lookup field as an option when building a web-to-lead form). I picked up the name and values of the options in the the lookup, so it looks like this (I'm pretty sure all the values and names are correct..but this doesn't work when trying to post the data to salesforce (no errors, just that the data doesn't populate the field in Salesforce. I heard this used to work, but it's not working for me...any ideas?
<select name="CF00NU0000002TPVQ" id="CF00NU0000002TPVQ">
<option value="a00U00000023IRH">Session 1</option>
<option value="a00U00000023IhL">Session 2</option>
</select>