How to store lead source value on sugarCRM leads?

i create new custom form and forward data on sugarCRM leads. my all other data store properly but lead source value not store. i also used <input type="hidden" name="lead_source"  tabindex="-1" title="" value="website" aria-label="Lead Source" style="display: none;"> in my form.but value not update on sugarCRM leads..how can i fix this issue.