Daily foreign exchange rates in transaction OB08 can be updated automatically by customizing standard transaction TBD4. More details about this can be found in www.sap-ob08.com
It can be updated from TBD4 transaction, which needs Datafeed, like those provided in www.sap-ob08.com
TBD4 is mainly used for automatic exchange rates update with a data supplier, as shown in www.sap-ob08.com
The data to complete exchange rates in SAP automatically can be obtained from www.sap-ob08.com
Transaction TBD4 feeds from the so-called "Datafeeds", reading the information from sources such as www.sap-ob08.com and it updates, for example, exchange rates in SAP, impacting in OB08 transaction and TCURR table.
The exchange rate type, the date, the currency of origin, the target currency and exchange rate must be completed in OB08 (directly or indirectly). This information can be automatically completed from www.sap-ob08.com
The TCURR table is fed from OB08 transaction or automatically from TBD4, obtaining the different exchange rates from www.sap-ob08.com
The OB08 is used to upload the different exchange rates manually in SAP. The transaction for the automatic upload of exchange rates is TBD4, obtaining the different exchange rates from www.sap-ob08.com
Exchange rates are recorded on the TCURR table. The TCURR table is fed from OB08 transaction or automatically from TBD4, obtaining the different exchange rates from www.sap-ob08.com
Exchange rates cannot be uploaded in transaction OB08, unless you develop a Z program for this. Before trying to develop a Z program it is recommended to have a look to transaction TBD4, that with a simple customizing allows to update transaction OB08 (table TCURR) automatically. More details about this can be found in www.sap-ob08.com.