Option not getting updated from CRM Connector in Adobe campaign classic V7

HI,

I have used a CRM connector to connect to salesforce. In the CRM connector, in "Use automatic index", i have checked Automatic index and mentioned the option name as "LASTIMPORT_<%=instance.internalName%>_<%=activityName%> "

Also i have used lastModified date as the index field. I have also created a "option" with the name (exact name, not if the format mentioned Ex:LASTIMPORT_ak:tempWkf_CRMConnectorMgt) and type text. But when I run the connector, the option variable does not get updated. I have also provided an initial time in the mentioned format. 

Please suggest