BUP_MASK_FIELDS 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 "SAP BP: Structure used for the BAdI BUPA_ MASK_LIST_ITEM" 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_BUP_MASK_FIELDS TYPE BUP_MASK_FIELDS.
The BUP_MASK_FIELDS table consists of various fields, each holding specific information or linking keys about SAP BP: Structure used for the BAdI BUPA_ MASK_LIST_ITEM data available in SAP. These include MASK_FLAG (Boolean Type, Do Not Use in Interfaces!), MASK_CHAR (Single-Character Indicator), MASK_LENGTH ()... 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. .