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title: >-
  DataLens On-premises error
  ERR.DS_API.FORMULA.VALIDATION.WIN_FUNC.BFB_UNSELECTED_DIMENSION
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  This page describes the Window function has unselected dimension DataLens
  On-premises error.
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# [DataLens On-premises] 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.