Allowed storage unit types not defined for storage type &

What causes this issue?

<GL:storage_unit_type>Storage unit types</> are defined for each
<GL:storage_type>storage type</>. The storage unit type you have used
is not allowed for the storage type concerned.


&what_to_do&
If you want to use the selected storage unit type in a new or existing
storage type maintain the table view for Storage unit types allowed per
storage type.

Error message extract from SAP system. Copyright SAP SE.