PCA_BAPI0015_ALLX 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 "X-Bar Transfer Fields for BAPI0015_* Structures with X-Bar" 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_PCA_BAPI0015_ALLX TYPE PCA_BAPI0015_ALLX.
The PCA_BAPI0015_ALLX table consists of various fields, each holding specific information or linking keys about X-Bar Transfer Fields for BAPI0015_* Structures with X-Bar data available in SAP. These include LONG_TEXT (Updated information in related user data field), IN_CHARGE (Updated information in related user data field), DEPARTMENT (Updated information in related user data field), PRCTR_HIER_GRP (Updated information in related user data field)... 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. .