Need your help!!! - How to create hierarchy datasource in ECC?

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Dear expert:

I have below questions need your help:

1. I know there are T-code BW07 and BW10 to create the hierarchy datasource in ECC, but not sure about their difference. Currently I need to load the material hierarchy, which T code should I use?

2. After I create the hierarchy datasource, is it possible to maintain the extraction logic in BADI RSU5_SAPI_BADI? Any place I need to pay attention to?

3. I tried transaction BW10 to generate the DataSource hierarchy. Once I created one hierarchy with T code MCK1, then in BW10, enter the custom data element, The system popup an error message: "Generated hierarchy: Data element A does not exist. Message no. R8334". Can anybody let me know how to resolve this problem?

Any answer would be really appreciated and thank you all in advance~

Tim