Capacity is still assigned to a work center

What causes this issue?

You attempted to delete a pooled capacity which is still assigned to a
work center.

System Response

The system does not delete pooled capacities if they are still assigned
to a work center.

How to fix this error?

With the help of a where-used list, you can determine the work centers
to which the pooled capacity is assigned. (In the work center menu,
select the menu options <LS>Reporting -> Where-used -> Capacity</>)
If necessary, delete the assignments to the individual work centers
before you delete the pooled capacity.

Error message extract from SAP system. Copyright SAP SE.