As was noted above, if you are just using Lacerte to prepare tax returns, see the link below for a much better place to post questions.

https://proconnect.intuit.com/community/lacerte-tax/discussion/03/302

As for your tax question, it might not be passive, and therefore the losses are allowed and not carried over.

An activity is passive if (a) it is defined as a "rental" for passive loss purposes or (b) it is something that is NOT Materially Participated in.

Because it is short term rental, that avoids the automatic "rental" that makes things passive.  Therefore, if your client Materially Participated in the activity, it would not be passive and therefore the losses are allowed.