Once in a lifetime for residential property only. For majority, it won't apply because:
i) if you sell after 5 years - no tax;
ii) if you sell at a loss - no tax.

Only claim if you make a handsome profit for selling within 5 years. Nowadays where got residential property can flip within 5 years for handsome profit? I an sure somewhere got but like finding needle in haystack

What is the region of your profit? Remember to factor in the costs such as stamp duty paid, legal fees and agents fees. After that still got profit?