The material cannot be maintained since no maintainable data transferred

What causes this issue?

You wanted to maintain an existing material master record as follows:
By changing it
However, you have not yet maintained the material master record for the
<DS:GLOS.organizational_level>organizational levels</> and data fields
specified, or <DS:GLOS.user_department>user departments</> selected.
You can therefore process this data only in <LS>Create</> mode.
By extending it
However, you have already fully created the material master record for
the organizational levels and data fields specified, or user
departments selected. You can therefore process this data only in
<LS>Change</> mode.
In both cases, this message can appear if there is no maintainable user
department left. This occurs if you have not set the <LS>Check required
fields</> indicator when transferring data (program RMDATIND). Although
the absence of an entry in <DS:GLOS.required_field>required fields</>
does not then necessarily result in an error, the number of
maintainable user departments is reduced accordingly.

System Response

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

How to fix this error?

Depending on the cause, maintain the material master record in
<LS>Create</> or <LS>Change</> mode, or also transfer the missing
required fields.

Error message extract from SAP system. Copyright SAP SE.