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What is the decision logic of SAP CRM Product category, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, I hope you can gain something.

(1) on UI, we can see that there is an indicator called "Base Category" in Category AB.

(2) on the GenIL layer, we can also see that Product has two relation, one "ProductBaseCategory" and one "ProductCategory". The two relation share an object (table), that is, "COMM_PRPRDCATR".

(3) but we found that the field "Is_Base_Category" is not actually stored in this table. That is, this field is determine during runtime.

(4) you can see from the following figure that this field is implemented in MAP_TO_UI_STRUCTURE, which is used in GenIL API to convert Native API layer data into GenIL layer data format. (it can be seen that this interface can be used to implement the function of a GenIL layer transformation field.)

(5) whether a category assignment is a base category can be seen from the above code, which is judged by whether the corresponding hierarchy id of this category is the same as the hierarchy id of product. When creating a Product, the hierarchy id of the first selected category will be assigned to the hierarchy id of product.

After that, when you choose category, you cannot choose the same hierarchy as the first category.

The figure above shows that when you select category, the hierarchy corresponding to the existing category will be generated by default as the query parameter of "Is Not".

If you forcibly remove these restrictions, select an incorrect category, and the following error message will trigger.

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