MSIT_PRFORMATBASIC is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "Product ID Conversion: General Data" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_MSIT_PRFORMATBASIC TYPE MSIT_PRFORMATBASIC.
The MSIT_PRFORMATBASIC table consists of various fields, each holding specific information or linking keys about Product ID Conversion: General Data data available in SAP. These include CLIENT (Client), LEXI (Save Product IDs Lexicographically), LENGTH (Maximum Input/Output Length of Product ID), MASK (Template for Converting the Product ID)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .