Managing 'error in services' in screen

Hi, i'm using apache ofbiz 12.04.01, i want to know how to manage error (how
to ingore errors of execution) in services that are executed in the screens.

For services in the *form exist an attribute like : ignore-error="true"

While for services called inside a screen it doen't exist

<!-- Screen -->

<screen name="findScreen">

<section>

<actions>

<set
field="titleProperty" value="PageTitleFindParty" />

<set
field="headerItem" value="find" />

<set
field="tabButtonItem" value="findparty" />

<service
service-name="findParty" auto-field-map="parameters" />

<!-- chiamata
al servizio -->

<service
service-name="XXXXXX">

</actions>

<widgets>

<decorator-screen name="main-decorator"

....

...

I want to ignore each error who could be happen in service "XXXXXX".
How i can do that?!?.

Thanks in advance

GF