External Material Group- how to find classes/subclasses

Do you know how I can find all the classes or subclasses that are listed on an external material group?
I know how to check all the external material groups that are on a class, but not vice versa.
Thanks, in advance, for your help.

I ve never worked with external material groups.
But  I know that they are defined and stored in table TWEW.
And when used in a material master, then the external material group is stored in material master table MARA in field EXTWG.
the field in TWEW is 18 characters long, and how you define the usage of this field content is up to yourself.
how does this link with classes/subclasses? do you use classification for assignment of external material groups?
or do you just mean these external material groups have a kind of structure in your system  like  class and subclass (which then would jsut be a text in table TWEW as well)

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    >
    shetty123s wrote:
    > Hi
    >
    > In MM60, I need to include the field 'external material group' from material master
    >
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    >
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