valueProcess.js

import("PostalAddress_lib");
import("system.neon");
import("system.result");
import("system.vars");

if(vars.get("$this.value") == null)
{
    if (vars.get("$param.OfferAddress_param")) 
    {
        result.string(vars.get("$param.OfferAddress_param"));
    }
    else if ((vars.get("$sys.recordstate") == neon.OPERATINGSTATE_NEW || vars.get("$sys.recordstate") == neon.OPERATINGSTATE_EDIT))
    {
        result.string(AddressUtils.getAddressById(vars.get("$field.ChosenAddress")));
    }
}