FMCY_S_STDATA 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 "Values of source and target during copy (needed for merging)" 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_FMCY_S_STDATA TYPE FMCY_S_STDATA.
The FMCY_S_STDATA table consists of various fields, each holding specific information or linking keys about Values of source and target during copy (needed for merging) data available in SAP. These include FUND (Fund), FUNDSCTR (Funds Center), CMMTITEM (Commitment Item), FUNCAREA (Functional Area)... 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. .