Characteristic "Article" is missing and article planning is not possible

What causes this issue?

You have selected the enhancement "Article Planning" for planning
layout &V2& (planning step &V1&). Before article planning can be run,
the system must have announced the planning characteristic with the
meaning "Article". This is currently, however, not the case.

System Response

The planning scenario can be activated but when manual planning for
planning layout &V2& is started, the enhancements for article planning
are automatically deactivated.

How to fix this error?

In the details screen for planning layout &V2&, deactivate the planning
enhancement "Article Planning" or enter the appropriate planning
characteristic for the article planning level in the screen "Special
Planning Levels".
Finally recheck the planing scenario.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.