estou usando<p:dialog> para adicionar uma nova linha ao<p:dataTable> recebendo entrada do usuário, mas não consigo redefini-la. Toda vez que mostra dados da entrada anterior e, em vez de adicionar, está editando a linha atual. Como faço para limpar os campos?

<h:form id="foodTableForm">
    <p:dataTable id="foodTableId" var="v" value="#{dashboardBean.myFoodList}" editable="true">
        <p:ajax event="rowEdit" listener="#{dashboardBean.onEdit}" />
        <p:ajax event="rowEditCancel" listener="#{dashboardBean.onCancel}" />
        <p:column sortBy="#{v.project}" headerText="Project Name">
            <p:cellEditor>
                <f:facet name="output">
                    <h:outputText value="#{v.project}" />
                </f:facet>
                <f:facet name="input">
                    <p:inputTextvalue="#{v.project}"/>
                </f:facet>
            </p:cellEditor>
        </p:column>
        <p:column headerText="#{msg['product.label.edit']}">
            <p:rowEditor />
        </p:column>
        <p:column headerText="#{msg['product.label.delete']}">
            <p:commandLink id="deleteFoodPromotion" actionListener="#{dashboardBean.deleteFoodPromotion(v)}" update="@form" />
        </p:column>
    </p:dataTable>
</h:form>

<h:form id="dialogInputForm">
    <p:dialog widgetVar="dlg">
        <p:inputText id="firstname" value="#{dashboardBean.foodPromoDTO.project}" required="true" />
        <p:calendar value="#{dashboardBean.foodPromoDTO.promoDate}" id="startDate" required="true" />
        <h:selectOneMenu value="#{dashboardBean.foodPromoDTO.action}" required="true">
            <f:selectItem itemLabel="Promo Start" itemValue="Promo Start" />
            <f:selectItem itemLabel="Promo End" itemValue="Promo End" />
        </h:selectOneMenu>
        <p:commandLink id="submitButton" value="Save" action="#{dashboardBean.addFoodPromotion}" update="@form" oncomplete="PF('dlg').hide();" />
    </p:dialog>
</h:form>