Error In saving lead

Hi All,

I got a error while in saving lead, asking for insufficient permission.

when i change the lead owner, I am able to save the lead
permission are given to user for sales user and sales manager,

Is the previous lead owner (for which there was an error) a sales user or manager? The reason he may not have the permission to save.

Permission to save is there but user is unable to save the lead when owner is filled with self id