@Irene2805 has the following excellent advice available here-
Before amending the return, create a copy so that your original return remains intact. If you haven't done this, I suggest you remove the changes you've made on the 1120S and follow these steps:
- Create a copy of the return. While in the original return, click File > Save As. Add the word Amended after the file name.
- Go through and make the changes.
- A 1120S will be created with the Amended return box marked.
- You should now be able to e-file the return.
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