Submit a form without validitating required fields primefaces - validation

Question

I want to have a form with JSF (Primefaces) to have a required field (the username is this example) to be required when saved. Also you can add books to every user, a user can have 0 ... n books. If you add a new book, it is required to give it an author and a name.
I tried it with the code below and already tried many ways of the Partial Processing of Primefaces. However, it is not working correctly. Sometimes I have to enter the required username to add a book or save it not working at all. Is there a way, to only check the required username on save and ignore the required author and bookname?
This is the code for the example:
<h:form>
<p:outputPanel id=„userdetails“>
<p:inputText id="name" value="#{bean.name}" />
</p:outputPanel>
<p:inputText id="txt_title" value="#{createBookBean.book.title}"
required="true" />
<p:inputText id="txt_author" required="true"
value="#{createBookBean.book.author}" />
<p:commandButton value="Reset" type="reset" />
<p:commandButton id="btn_add" value="Add"
update="books msgs #parent" action="#{createBookBean.reinit}">
<p:collector value="#{createBookBean.book}"
addTo="#{createBookBean.books}" />
</p:commandButton>
<p:outputPanel id="books">
<p:dataTable id="booksTable" value="#{createBookBean.books}"
var="book">
<h:outputText value="#{book.title}" />
<h:outputText value="#{book.author}" />
<p:column>
<p:commandLink value="Remove" update=":form:books"
process=":form:books">
<p:collector value="#{book}"
removeFrom="#{createBookBean.books}" />
</p:commandLink>
</p:column>
</p:dataTable>
</p:outputPanel>
<p:commandButton value="Save" update="msgs" process="#form"
action="#{bean.save()}"></p:commandButton> // button to save, and ignore required bookname
</h:form>
// button to save, and ignore required bookname

Answer 1

For that purpose you can use immediate attribute of commandButton:
<p:commandButton value="Save" update="msgs" process="#form"
action="#{bean.save()}" immediate="true" />