@property<EOL><INDENT>def sum_sp_values(self):<DEDENT>
if self.values is None:<EOL><INDENT>ret = IdValues()<EOL><DEDENT>else:<EOL><INDENT>ret = IdValues({'<STR_LIT:0>': sum(int(x) for x in self.values.values())})<EOL><DEDENT>return ret<EOL>
return system level values (spa + spb)

input:
"values": {
    "spa": 385,
    "spb": 505
},

return:
"values": {
    "0": 890
},