Don't redisplay messages already shown in dialog in <p:messages autoUpdate="true">

I need to show error and warning messages in a dialog when it is showing. If dialog is not showing I need to show the messages in the container page

I have set a template using facelets in all views: template="/WEB-INF/templates/template.xhtml"> with this content:

<f:view locale="#{loginBB.localeCode}">
    <p:messages autoUpdate="true" closable="true" id="globalMessages" />
    <ui:insert name="content" />
</f:view>

In all dialogs I have the following:

<p:messages autoUpdate="true" closable="true" id="dialogMessages" />

When a dialog is showing the error messages appear in the dialog and in the view that hold it, but I need that only appears in the dialog.

What I am doing wrong? I don't know what to do

EDIT: According to the BalusC answer I did the following:

Template:

<f:view locale="#{loginBB.localeCode}">
    <ui:insert name="dialogs" />
    <p:messages autoUpdate="true" closable="true" redisplay="false" />
    <ui:insert name="content" />
</f:view>

View:

<ui:define name="content">
    ...
</ui:define>

<ui:define name="dialogs">
    <h:form id="formX">
        <p:dialog ... >
        </p:dialog>
    </h:form>
</ui:define>

When the dialog is opened it show the message in the dialog. This is OK. But when the dialog is closed, it doesn't show the message in the main page