In ERP, I have created one material with division = 01:

In CRM, activate division handling in this customizing:

And also create one customizing entry for Division 01 in CRM:

Now download material into CRM, you could observe the division 01 is downloaded and stored in CRM table:

And it could also be found in WebUI:

By default since this field is downloaded from ERP, it could not be changed in CRM.
You could create a new entry for settype COMM_PR_MAT in this customizing:

After that it could be changed in WebUI:

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