Product hierarchy field &1 cannot be adapted to the new structure

What causes this issue?

The definition of the product hierarchy has changed (structure PRODHS).
The hierarchy field generated in CO-PA, &V1& cannot be adapted to the
new definition, because it is already being used in structures or
tables.

System Response

The field &V1& does not appear in the list of fields that can be
selected.
It can no longer be used as a characteristic.

How to fix this error?

If you still want to define hierarchy field &V1& as a characteristic,
proceed as follows:
Display the where-used list for data element &V2& in database fields
using transaction SE12. <ZH>For hierarchy field &V1& to be adapted, a
data conversion must be carried out for all the tables listed!</>
First change the number of characters in the domain &V3& to match the
new definition of the product hierarchy, following the example below.
You can do this using transaction SE11.

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

Structure PRODHS Domain
Field Length name Number of characters
----------------------------------------------------
PRODH1 3 RKEG_PAPH1 3
PRODH2 2 RKEG_PAPH2 5
PRODH3 5 RKEG_PAPH3 10
PRODH4 8 RKEG_PAPH4 18
RESET N1

Error message extract from SAP system. Copyright SAP SE.