FMAAREL 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 "Assigned FM Account Assignments" 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_FMAAREL TYPE FMAAREL.
The FMAAREL table consists of various fields, each holding specific information or linking keys about Assigned FM Account Assignments data available in SAP. These include COMMITMENT (Commitment budget), SENDER (FM Account Assignment Subject to Cover), RECEIVER (FM Account Assignment Entitled to Cover), ERHPROZ (% of a Revenue Allotted to Expenditure FM Account Assignment)... 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. .