Having Trouble Adding Test Cases Through Import

I am using Excel 2010 to add steps to a test case that I imported from SpiraTest. For each test step, I inserted a row that has the ID of the test case in the Test# field, >TestStep is selected in the Row Type field, and there is text in the Test Step Description field and the Expected Result field. All the other columns for the new steps are blank. There are 12 rows. When I click Export to send the data back to SpiraTest, I get a  message that 6 rows were successfully completed. I can't find any changes made at all in the test cases, and the 12 new test steps are not added at all.

Any help would be appreciated. Thanks!