Submit Action items in the Sitecore tree are named automatically, if there is more than one of the same type per submit button then a name clash may occur. In most versions of Sitecore the AllowDuplicateItemNamesOnSameLevel configuration option can be set to allow this. However this does not work in Sitecore 9.3, or you may wish to keep this option disabled and still have multiple Submit Actions.
Sitecore 10.2 automatically renames items with numeric suffixes to resolve this issue.
This issue will result in a message like this when you attempt to save a form with multiple Submit Actions of the same type:
S4D offers a workaround that will resolve this issue for S4D-specific Submit Actions only. In the S4D.config file, set the FuseIT.S4D.EnableSubmitActionDuplicateHandler value to true.
<settings> <setting name="FuseIT.S4D.EnableSubmitActionDuplicateHandler" value="true" /> </settings>
This will suffix the form instances of the Submit Action item name with its Id to ensure unique names.