Sequence-dependent setup in operation &1 not on single activity resource

What causes this issue?

You should work with sequence-dependent setups in this operation. The
main resources that are defined in the modes are not single activity
resources.
The setup activity for the sequence-dependent setup must always be on a
single activity resource. A unique setup state is only given for single
activity resources. When sequence-dependent setup is considered, the
transfer of a setup state to another setup state is precisely
considered. As a result, this only works for single activity resources.

System Response

The Production Process Model cannot be activated. No orders for
in-house production can be created using this Production Process Model.

How to fix this error?

Enter a single resource activity as the main resource for a
sequence-dependent setup activity in all modes.


Note
These restrictions only refer to sequence-dependent setup. Any
resources can be used for sequence-independent setup (where the
duration of the setup activity is independent of the setup state of the
resource).

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.