This is by design. Once a lead has been promoted to an Opportunity all the communications are copied to the Opportunity and all further progress of the 'lead' should be done in the opportunity. All communication need to be stored against the opportunity and changes to the contact details will be against the person or company linked to the opportunity and not the Lead.

Thanks Jeff,

There a a couple of fields we would like to change of some items which have been "locked". is there a work around to alter these?

Mark

See

community.sagecrm.com/.../edit-a-converted-lead-a-trick-using-runblock-and-buttongroups.aspx