If the form is submitting to DBXL and DBXL is mapping to SharePoint, there's no need for a data connection that submits to SharePoint (hopefully your form doesn't have one!).
When defining the DBXL Submit data connection, there is a DBXL::Name parameter, which is then used in the ShP form library as the Name. If the parameter is left blank in the data connection wizard, then DBXL will use the DocID as the form name.