The ritual is a form of ngaras , a tradition of seeking parental blessings believed to be essential for receiving God's grace in a marriage.
Sungkeman is often performed as a precursor to or following rituals like Siraman (symbolic bathing), representing the purification of the soul before starting a new chapter. Teks Sungkeman Sunda - Full Image Site
It serves as a formal opportunity for the couple to apologize for childhood transgressions and thank their parents for their lifelong care and sacrifices. The ritual is a form of ngaras ,