$where_clause in set_relation_n_n not working

[iam-subho]

https://www.grocerycrud.com/forums/topic/136794-unknown-column-when-using-where-clause-in-set-relation-n-n/

please check this bug

[mckaygerhard]

@iam-subho before open a issue you must first search .. check at #396 and also tere's others issues that covers this problem already