I have one material in ERP:

This material has 001 assigned as Material group, 001000010500000110 as product hierarchy.
Type: HAWA

Once this material is synchronized to CRM, three product categories are automatically assigned to this product as below:

Mapping relationship

In fact, the whole product hierarchy in ERP ( tree style ) is downloaded to CRM via middleware:
Below is a screenshot of Product hierarchy maintenance view in ERP.

It is not supported to review product hierarchy in ERP via tree style, so Jerry has written a tool to achieve it:

Conclusion

Product hierarchy in ERP will be downloaded to CRM as product hierarchy.
The sreenshot below is downloaded product hierarchy in CRM:

Material group in ERP will also be downloaded to CRM as product hierarchy - flat structure, since material group in ERP is also flat.

Yesterday we are talking about where the following three hierarchy IDs are hardcoded.

The IDs are pre-configured into this System table. The entry could not be changed by customer.

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