1040-X form missing

[Ed-Houston]

Electronically filed the 1040 which included the NIIT Form 8960 with a tax amount showing.  Later an amended K-1 with less investment income was received, so an amended 1040 was e-filed.  That resulted in zero NIIT.  The taxpayer received a letter from the IRS regarding the 1040-X stating "Form 8960 is blank, illegible, missing, or damaged."  Using the e-file support tool to View e-file, I don't see a Form 8960 as being included in the amended return.  Granted it would not be necessary to file had zero tax been due in the original return, but amended returns are supposed to include all forms that were changed.  Also, one would expect the IRS, person or computer, to realize that the NIIT had dropped to zero and not worry about the form.  Still, a letter was received and a response will be necessary.  Of course, to get Lacerte programmers to consider issues, it seems we have to post here so others can comment thus helping establish programming priorities.  Perhaps, include the "form" in the amended return or a diagnostic advising attaching it?