Single item planning in simultation mode not possible for material &1 &2

What causes this issue?

You want to plan material &V1& plant &V2& within multilevel single-item
planning. This material is part of a discontinuation. That is to say,
the material is
A part to be discontinued,
A dependent part to be discontinued (parallel discontinuation), or
A follow-up material.

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

Planning a material that is part of a discontinuation in the simulation
mode of multilevel single-item planning is not supported.

System Response

How to fix this error?

Execute multilevel single-item planning without simulation mode for
this material, or plan the material within the total planning run.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.