If the defendant was not served and did not appear, he may take advantage of the defect by affidavit of illegality. However, if he has had his day in court, he may not go behind the judgment by an affidavit of illegality.
OCGA § 9-13-121
If the defendant was not served and did not appear, he may take advantage of the defect by affidavit of illegality. However, if he has had his day in court, he may not go behind the judgment by an affidavit of illegality.
OCGA § 9-13-121