wait for method to complete?

[tbscope]

submitAll() returns true or false based on success. You can take advantage of this.

if (submitAll())
    // requery and check what has been added (you can do that before adding too)
else
    // some error occured

if (submitAll())
    // requery and check what has been added (you can do that before adding too)
else
    // some error occured

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Note though that this will block till all the data is added.