Jyothimani,

I think you need a constraint to check "name should not have space".

If it's so, you can create an odoo constraint and use regular expression to check for space in name, like

first add import re(to import regular expression class) then,

def _check_name(self, cr, uid, ids, context=None): 

    for record in self.browse(cr, uid, ids, context=context): 

# checking if regular expression find any ' '(space) in name string then it will return False

        has_space = re.compile(' ').search(record.name)

        if has_space:

            return False

    return True

 and add _constraint as:

_constraints = [(_check_name, 'YOUR_MESSAGE', ['name'])]

Hop it will help!