SU management must first be deactivated in all storage types

What causes this issue?

You attempted to deactivate storage unit management at the warehouse
number level before deactivating it at the storage type level.

How to fix this error?

If you want to deactivate storage unit management for a warehouse
number, you must first deactivate SU management in each SU-managed
storage type associated with that warehouse number.

Error message extract from SAP system. Copyright SAP SE.