I agree with you. Different analyst may use slightly modified definitions while calculating ratios. There could be two interpretations of Capital Employed:
- Total Assets - Current Liabilities (This would include provisions, deferred taxed and all interest bearing liabilities)
- Shareholders’ equity + Debt (This would exclude all liabilities which do not have interest payment as it may not be categorized as capital like Deferred taxes, Provisions etc.)
Sometimes it is also dependent upon the nature of operations/industry which warrants for certain modifications in definition to reflect accurate numbers.
To understand the disparity in quotes, you will probably have to read through the definitions being used to calculate ratios to understand different approaches being adopted by different analysts/sources.