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Morninstar change in certain values fields

I am currently running with the warnings below. Can someone please advice as to what is the old and new calculation of morningstar for the parameters below? Thanks

2017-01-03 08:45 WARN :517: QuantopianWarning: Morningstar adjusted the calculation for the field 'enterprise_value' starting on April 1, 2018.
The historical values for this field will surface from the vendor in mid-April 2018.
Until the historical data is updated in mid-April, your algorithm will see old (before April 1) and new (after April 1) definitions of the field in the same backtest.

2017-01-03 08:45 WARN :517: QuantopianWarning: Morningstar adjusted the calculation for the field 'roe' starting on April 1, 2018.
The historical values for this field will surface from the vendor in mid-April 2018.
Until the historical data is updated in mid-April, your algorithm will see old (before April 1) and new (after April 1) definitions of the field in the same backtest.

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