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Question

Terry, you need to revisit the architecture. If the updates are processed on submit, why bother to send them individually to the server - as Tim nicely pointed out. What I would do:

create 2 Java classes: one "Order" one "LineItem"
Let the Order class implement the Map interface Map
Use the Order class for your repeat control (it will give you the key of each LineItem as the repeat variable)
Bind the fields inside the repeat to Order[RepeatKey].fieldName
Use Order in a object data source
Implement the save method in the Order class and call it in the save method of the object data source

Very rought outline, let me know if you need me to elaborate. The Java Collections Framework is your friend.

It is easier than it looks:

   public class LineItem {

private String unid;
private String partno;
private int quantity;
private long unitprice;

/**
 * Constructor for new items
 */
public LineItem() {
    this.unid = null;
}

/**
 * Constructor for existing items
 */
public LineItem(Document doc) {
    this.unid = doc.getUniversalId();
    // more here
}


/**
 * @return the unid
 */
public String getUnid() {
    return this.unid;
}

/**
 * @return the partno
 */
public String getPartno() {
    return this.partno;
}
/**
 * @param partno the partno to set
 */
public void setPartno(String partno) {
    this.partno = partno;
}
/**
 * @return the quantity
 */
public int getQuantity() {
    return this.quantity;
}
/**
 * @param quantity the quantity to set
 */
public void setQuantity(int quantity) {
    this.quantity = quantity;
}
/**
 * @return the unitprice
 */
public long getUnitprice() {
    return this.unitprice;
}
/**
 * @param unitprice the unitprice to set
 */
public void setUnitprice(long unitprice) {
    this.unitprice = unitprice;
}

public void save(Database db) {
    Document doc = null;
    if (this.unid == null) {
        doc = db.createDocument();
        doc.replaceItem("Form", "LineItem");
    }
    doc.replaceItem("PartNo", this.partno);
    // More here
    doc.save();
}
}

and for the Order - presuming you load from a document collection.

public class Order implements Map<String, LineItem> {

// You might want to have a stack here to keep order
private final Map<String, LineItem> backingMap          = new LinkedHashMap<String, LineItem>();
private final Set<String>           deletedItemKeys     = new HashSet<String>();

// The key we use for new items when unid is null
private int                         lastNewItemNumber   = 0;

@Override
public int size() {
    return this.backingMap.size();
}

@Override
public boolean isEmpty() {
    return this.backingMap.isEmpty();
}

@Override
public boolean containsKey(Object key) {
    return this.backingMap.containsKey(key);
}

@Override
public boolean containsValue(Object value) {
    return this.backingMap.containsValue(value);
}

@Override
public LineItem get(Object key) {
    return this.backingMap.get(key);
}

@Override
public LineItem put(String key, LineItem value) {
    // Here it gets a little special
    // We need to prevent null keys
    if (key == null) {
        key = String.valueOf(this.lastNewItemNumber);
        lastNewItemNumber++;
    }
    this.deletedItemKeys.remove(key);
    return this.backingMap.put(key, value);
}

@Override
public LineItem remove(Object key) {
    this.deletedItemKeys.add(key.toString());
    return this.backingMap.remove(key);
}

@Override
public void putAll(Map<? extends String, ? extends LineItem> m) {
    for (Map.Entry<? extends String, ? extends LineItem> me : m.entrySet()) {
        this.put(me.getKey(), me.getValue());
    }
}

@Override
public void clear() {
    this.deletedItemKeys.addAll(this.backingMap.keySet());
    this.backingMap.clear();
}

@Override
public Set<String> keySet() {
    return this.backingMap.keySet();
}

@Override
public Collection<LineItem> values() {
    return this.backingMap.values();
}

@Override
public Set<java.util.Map.Entry<String, LineItem>> entrySet() {
    return this.backingMap.entrySet();
}

public void load(NotesDocumentCollection dc) throws NotesException {
    Document doc = dc.getFirstDocument();
    Document nextDoc;
    while (doc != null) {
        nextDoc = dc.getNextDocument(doc);
        LineItem li = new LineItem(doc);
        this.put(doc.getUniversalId(), li);
        doc.recycle();
        doc = nextDoc;
    }

    doc.recyle();
}

public void save(Database db) {
    for (LineItem item : this.backingMap.values()) {
        item.save(db);
    }

    // Now kill the left overs - needs error handling
    for (String morituri : this.deletedItemKeys) {
        Document delDoc = db.getDocumentByUnid(morituri);
        if (delDoc != null) {
            delDoc.remove(true);
        }
    }       
}
}