Asset turnover is ambiguous

Kaplan’s management accounting study text (valid from 1/9/2019 till 31/8/2020) says,

Asset Turnover = Revenue / Capital employed

While every other resource says,

Asset Turnover = Revenue / Total assets

Now i know Capital employed and total assets are not the same because capital employed is total assets – current liabilities. Please tell what’s the correct way of calculating it. Thanks prof!