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Differentiation of Value-Only and Value/Quantity Differences 
Purpose
For automatic postings in case of differences in self-billing, the system differentiates between value-only and value-and-quantity differences. This differentiation is not only important information for the person responsible, it also affects the statistics update in the system, in particular the Logistics Information System (that is, the Sales Information System) and CO-PA (statistics on revenue values and sales quantities.)
For example, differentiation between value-only and value/quantity differences means that automatic postings created for value differences do not cause an increase in billed quantities in the Sales Information System. Differences in quantity, however, are updated to the information system.
For this purpose, SAP has shipped as standard two new document types (optional) and two new item categories (always needed), both called G2WT and L2WT.
Prerequisites

If you use the standard document types G2 and L2, the document types must be set for the request documents under Settings ®
General Parameters. You have two alternatives
1. You set G2/L2 for both quantity-only and quantity/value postings. In this case, item categories are necessary, so you must enter the item categories for value-only transactions (G2WT and L2WT) in the item category assignment, so that they are allowed for the document types G2 and L2.
2. You set G2/L2 and G2WT/L2WT respectively. In this case, the system finds the correct item categories via item category determination.
Process Flow
For an example of the settings required and the process flow, see
Example of Differentiation of Difference Type.
