FRMLS_SUM_DATA 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 "RMS-FRM: Totals" 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_FRMLS_SUM_DATA TYPE FRMLS_SUM_DATA.
The FRMLS_SUM_DATA table consists of various fields, each holding specific information or linking keys about RMS-FRM: Totals data available in SAP. These include BASE_UNIT (Base Unit of Measure of a Formula), INP_TGT_QTY (Target Input Quantity), INP_TGT_UNIT (Unit of Measure)... 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. .