sql query to delete data from 2 tables : currently trying to accomplish  the following task adn i using this sql to doit but still not working 

'' DoCmd.RunSQL " delete tbl_siphon_req_info.* from tbl_siphon_req_info a, tbl_siphon_PO b where concat(a.ross_PO_nbr, a.ross_sku12) = Concat(b.PO_ID, Sbstr(bitem_id,1,12))"

if any one can help me to correct and complete what i need to do... thanks 

