Explain the difference between Gen. Item Category Group and Item Category Group in Material master.

General item category grp is used in the sales processes like BOM, where we have higher item category and the default item
categories.  

General item category grp would refer to the higher level item category and item category grp would refer to the default item category

*General Item category Group* is an extension item category group. Example: if one select item catagory group as NORM, but under item category group, NORM can further be classified as Service item, packagaing item or Normal
item using "general item category group". 

Also, General item category group is maintained at client level, this field can be maintain from Basic Data View of Material Master. Thus in case item category group is missing, then general item category group is used for item category determination.

*Item category group* determines how a material is processed in the sales order. When processing sales and distribution
documents, the system uses the item category group to determine the item category and proposes it in the respective document. Item category group is defined in the Sales Org View 2 of Material Master Record.  

Example, in the standard SAP System, the item category group NORM is defined for materials kept in stock and the group DIEN for services and non-stock material

*-- Skylab

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