Data handling with nested repeat controls - xpages

Question

In my Application I, as a user, can create "items" through an XPage.
Those items have an undefined amount of entries in a list (a simple text list) which I create myself. Those entries will be used to generate checkBoxes later.
I have a list of customers. I can add multiple items to each customer. The items are displayed inside a repeat control. Each row has an inner repeat control for the checkBoxes (generated from the text list).
Now my problem is, that I'm not sure how to handle the data or more precisely the checking/unchecking of the checkBoxes because I have an undefined number of items and an undefined number of the checkBoxes inside the items plus the checkBoxes are editable.
I hope my issue is clear. Please let me know if there is need for clarification or if you need some code - even though I think the problem lies purely with the logic in my head.
EDIT:
The custom control that is used in the customer XPage the checkBoxes I mentioned above are used for `status.
As you will see below I simply get the search keys for the items and use them to find the text lists to create the checkboxes.
Since the items are merely templates that are used for every user that logs in, I can't use those documents to save the state of the checkboxes.
The only thing I can think of at this moment is to actually create a document for every item that is being added to the customer and use this document as the storage - but isn't there a better way?
<?xml version="1.0" encoding="UTF-8"?>
<xp:view xmlns:xp="http://www.ibm.com/xsp/core">
<xp:this.resources>
<xp:styleSheet href="/item.css"></xp:styleSheet>
</xp:this.resources>
<xp:repeat id="repeat1" rows="30" var="rowData" indexVar="rowIndex" style="border: 1px solid #ccc;">
<xp:this.value>
<![CDATA[#{javascript:return currentForm.getItemValue("itemSearchkey");}]]>
</xp:this.value>
<xp:div>
<xp:button styleClass="accordion" id="button1">
<xp:this.value>
<![CDATA[#{javascript:
var itemTitle = "";
if(!"".equals(rowData) || rowData != null) {
itemTitle = itemBean.getItemTitle(rowData);
}
return itemTitle;
}]]>
</xp:this.value>
<xp:eventHandler event="onclick" submit="false">
<xp:this.script>
<![CDATA[
// ... some code for the accordion to work
]]>
</xp:this.script>
</xp:eventHandler>
</xp:button>
<xp:div styleClass="panel">
<xp:repeat id="repeat2" rows="30" var="rowDataStatus" indexVar="rowIndexStatus">
<xp:this.value>
<![CDATA[#{javascript:
var statusVector = null;
if(!"".equals(rowData) || rowData != null) {
statusVector = itemBean.getStatusList(rowData);
}
return statusVector;
}]]>
</xp:this.value>
<xp:checkBox id="checkBox1" checkedValue="true" uncheckedValue="false">
<xp:this.text><![CDATA[#{javascript:return rowDataStatus;}]]></xp:this.text>
</xp:checkBox>
</xp:repeat>
</xp:div>
</xp:div>
</xp:repeat>
</xp:view>
To create the list that is used for the checkBoxes I use a simple inputTextArea in a separate custom control. currentForm is the datasource:
...
<xp:inputTextarea id="statusList" value="#{currentForm.StatusList}"
multipleSeparator="#{javascript:#NewLine()}" rows="8">
</xp:inputTextarea>
...