[Yandex DataLens] Window function has unselected dimension

ERR.DS_API.FORMULA.VALIDATION.WIN_FUNC.BFB_UNSELECTED_DIMENSION

The error occurs when, in the window function formula, BEFORE FILTER BY is followed by a dimension not used in the chart, i.e., not included in any of its sections.
To fix the error, drag the indicated dimension into one of the chart sections or use a different dimension.