CRM - Updating a multiselect field using integration tasks

CRM - Updating a multiselect field using integration tasks

Hi,

I tried to update some field in the Leads Module of CRM using zoho integration tasks.  The field such as single line, pick list are updated successfully  but the MULTISELECT  field is not updating.  I have done lot of modifications in the map variable which contains the parameter value yet doesn't work.  

If there is any way of  solving this problem, plz help me with the code. 

Thanks,