No average plant stock has been maintained for long-term planning

What causes this issue?

In Long-Term Planning, you can have the system calculate average plant
stock. You can then display and, if necessary, change the results in
the material master record.
This calculation has not yet been carried out.

System Response

Plant stock cannot be displayed.

How to fix this error?

Calculate average plant stock in Long-Term Planning.

Error message extract from SAP system. Copyright SAP SE.