It exists within the hierarchy of Kshatriya -> Rajputs -> Saini -> Longia/Longiya.
Kshatriya is a warrior class, one of the highest in the caste
system. One of the subcastes of Kshatriya's is Sikh Rajputs that goes down to Sikh Saini's. Longiya/Longia is a subcaste of Sikh Saini's. Although Rajputs/Sainis are considered high in status
outside of Punjab, inside Punjab Sikh Rajputs and Sainis are equivalent to Sikh Jats - since they all come under 'Landlords'. They are also known as the 'martial race'.
Almost all Rajputs/Saini's in Punjab are Sikhs. Sikhism denies the caste
system. Thus, intermarriage among Sikhs with different 'clans' (
ex. Jodhas, Jats, Saini's
etc. ) is common.