Code:
awk -F, '$23!~/^302/' file
Data,05678,9131,2010,18,17/01/2011,2,1,2,DPE,TEST,2,0,18/12/2010,,,,1286200,0,09/08/2010,-2949,,1131,00,1678,all,131,99998881131,1,
Data,6909,289,2010,031,,1,1,1,Irvin,Andé,2,0,,520007980,ON,BH,0,0,,0,,000569,0,1909,CEST,56909,93235 6909,1,