UPB_CUST_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 "Structure for Currency Translation Settings" 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_UPB_CUST_DATA TYPE UPB_CUST_DATA.
The UPB_CUST_DATA table consists of various fields, each holding specific information or linking keys about Structure for Currency Translation Settings data available in SAP. These include SEQNR (Sequence Number), RATE_TYPE (Exchange Rate Type), VALID_FROM (Date from Which Entry Is Valid), VALID_TO (Date from Which Entry Is Valid)... 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. .