Is it possible to display Number of Nights on Internet Expenses for Accommodation items only?

We are reimplementing Internet Expenses in R12 and would like to display the Number of Nights parameter only on expense items where the category = Accommodation.

At the moment Number of Nights appears on every expense item. At the moment we have a personalization to default it to 1 and a tip message asking users not to change it, but we would like to hide it completely for all non-accommodation items.

Is this possible without customisation?