MPL_PARENT_STRUCTURE 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 "Structure Representing the MPL Tree" 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_MPL_PARENT_STRUCTURE TYPE MPL_PARENT_STRUCTURE.
The MPL_PARENT_STRUCTURE table consists of various fields, each holding specific information or linking keys about Structure Representing the MPL Tree data available in SAP. These include PARENTGUID (Internal Number of iPPE Node), PARENTOTYPE (iPPE Object Type), PARENTAPPLTYPE (Application Object Type for iPPE), PNAME (iPPE Node Description)... 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. .