Correct word for "unsubmitted"?

Unsubmitted.

Unsubmitted seems incorrect since it has not been submitted yet giving the misleading notion it has been retracted or removed.

Those would be retracted, not unsubmitted. The word you want here, is unsubmitted.

Possibilities include:

• Processing
• Under review
• Unsubmitted
• Active
• Aborted
• Uncompleted
• Not placed

Which one makes more sense than another depends on your specific situation. We need to know how a state like this can come to pass.

Edit: Based on your comment to the addition question I would suggest to use the phrase 'The customer has active orders that are not placed'. Apparently a user was working on an order, but it was not fully completed, and as a result the order could not be placed yet.