In Workday Adaptive Planning standard sheets, cell background colors communicate the editability status of each cell to the user. A grey cell background indicates that the cell is read-only — it may contain a calculated value from a formula or display a rolled-up result, but the user cannot directly enter or modify data in that cell. Read-only cells appear grey to clearly differentiate them from white/editable cells, providing instant visual feedback about where data entry is permitted. This applies to cells that contain shared formulas, cells that are restricted by the sheet's Level Availability configuration, and cells that display rollup calculations. A white cell background indicates an editable cell where a user can enter values. Blue or colored cell backgrounds may indicate other states depending on configuration. Errors in cells are typically displayed with error text rather than a grey background. Rollup accounts do appear grey, but the grey color specifically means read-only, which is a broader category. Reference: Workday Adaptive Planning — Standard Sheet Interface, Cell Color Coding, Read-Only vs Editable Cells.