Hello @gbe59 !
Yes, it is best to wait until the IRS has reviewed and processed your initial amendment before submitting another one. This will prevent any confusion with your return.
It might be best to check the IRS website for the status of your amendment to know when it is processed. Then you can send in the second amendment.
Here is a link to check the status:https://www.irs.gov/filing/wheres-my-amended-return
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