I want to stop user from adding new line in one2many field.  

but with an twist that only if this record has certain type (Any domain, eg:   type=available & is_new_lead = true)

how to achieve this ?  

As we can not pass domain to the create attribute. we can only pass create=true or create=false.

Thanks in Advance. 

Update: Can not use raise warning on record save, Due to some status and logic concern.