FCOMS_ACTTYPE_PERIOD 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 "BOL: Activity Type Master Data Periods" 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_FCOMS_ACTTYPE_PERIOD TYPE FCOMS_ACTTYPE_PERIOD.
The FCOMS_ACTTYPE_PERIOD table consists of various fields, each holding specific information or linking keys about BOL: Activity Type Master Data Periods data available in SAP. These include KOKRS (Controlling Area), LSTAR (Activity Type), DATBI (Valid To Date), DATAB (Valid-From Date)... 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. .