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If one employee has one job offer active for ex:new york and wants to add a second offer but in difrent city ex california than de second ad listing shows the firts listings adress in location so the both offers are in new york, the reason is that the city adress is set up in employee account is ther a way to change this ?

@Nagy Csaba
Should work simply by rewritting address when publishing new offer.

From item.php:
    $place_of_work = (osc_item_city() <> '' ? osc_item_city() : (osc_item_region() <> '' ? osc_item_region() : (osc_item_country() <> '' ? osc_item_country() : '-')));

SO it's taking what was set on item.