Activate SAP Forecasting and Replenishment; see long text

What causes this issue?

The Customizing settings indicate that SAP Forecasting and Replenishment
is not activated. The calculation of the
<DS:DE.RTST_OP_RCOV_ENABLED>range of coverage</> is based on the stock
projection. The stock projection is created in and retrieved from the
SAP Forecasting and Replenishment system; therefore, the range of
coverage cannot be calculated.
If you have implemented
<DS:SIMG.BADI_RTST_OP_STOCK_PROJECTION>BAdI: Enhancement for Entity
"Stock Projection"</> to provide stock projection data, this message is
only a warning.

System Response

The range of coverage is not displayed.

How to fix this error?

Contact your system administrator.

Procedure for System Administrators

Activate SAP Forecasting and Replenishment as described in the
documentation for the Customizing activity <LS>Define Basic Settings for
Order Products</> or implement
<DS:SIMG.BADI_RTST_OP_STOCK_PROJECTION>BAdI: Enhancement for Entity
"Stock Projection"</>.

Error message extract from SAP system. Copyright SAP SE.