Not currently possible to switch strategy

What causes this issue?

You want to switch from a strategy with manual kanbans to another
strategy or vice versa.
This is only possible if no kanbans exist in the control cycle for
which a goods receipt can be posted. If a goods receipt was posted
after the strategy is changed, this would lead to an error.

System Response

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

How to fix this error?

First, make sure that there are no kanbans in the control cycle for
which a goods receipt can be posted.
Then you can change the strategy.

Error message extract from SAP system. Copyright SAP SE.