Materials are indicated with red, yellow, and green traffic lights in the material tree and in the material lists for the MRP list and for the stock/requirements list.

The traffic light values (red, yellow, green) indicate how urgently materials need to be processed. Red traffic lights immediately indicate that the appropriate materials are critical and urgently need to be processed.

The traffic light display is controlled by ranges of coverage and exception groups. As standard, a red traffic light is displayed when the days' supply, receipt days' supply 1, or receipt days' supply 2 are less than or equal to zero, or when an exception message for group 8 is displayed. You can change and save these settings on a user-specific basis under the menu path Settings ® Define traffic light.