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BabuMBabuM 

is it possible to access a field in validation rule which is not part of page layout

In a standard edit page of contract, thru url want to set the field value and this field will not be a part of page layout. While clicking on "Save" I want to fire validation rule using the filed value which I set thru URL. ex: /setup/ui/recordtypeselect.jsp?ent=01IW00000008WtO&00NW0000000OLKz=FIELDVALUE&retURL=%2F{!Account.Id}&save_new_url=%2Fa1J%2Fe?retURL=%2F{!Account.Id}&CF00NW0000000Ny3l_lkid={!Account.Id}&CF00NW0000000Ny3l={!Account.Name}