Importance of header tables
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Every transaction caries two types of data: Header Data and Transactional/Item data.
The header data is stored in Header Tables and the Transactional data is stored in Item tables.
<b>VBAK</b> is header table for the Sales Documents data which stores the Sales Document number, date created, time of creation, name of the person created the Sales document and the quotation/inquiry is valid from details.
<b>VBAP</b> is item table for the sales document which stores the data of Sales document client, material number, sales document item and other material data for that sales document.
Rewards if useful.