See Item P18 - Termination value of other depreciating assets on the ATO website. You may then need to expand the list in the left-hand panel, and click the link to P18.
Click label K to open the worksheet (it) which provides access to the Depreciation worksheet. Refer to Intangible/Tangible depreciating assets worksheet (it).
The Depreciation worksheet can be opened from the worksheet (it) or directly from the return by selecting Preparation > Schedule > Depreciation worksheet. (Depreciation worksheet (d))
An amount of net PP or non-PP business income must be present, if any amount is present at item P18 for Termination value of other depreciating assets.
17-015 Depreciating assets
17-640 Termination value of depreciating assets