Some client applications do not connect to SAP ASE directly through the Open Client software, but through the ODBC (Open Database Connectivity) driver instead.
For example, PowerDesigner™ connects through the ODBC driver. Other third-party applications may also require the ODBC driver.
For SAP ASE versions earlier than 12.5, ODBC connections are built on top of the Open Client Client-Library, so you must install the Open Client software on the clients where you install the ODBC Driver.
You can also install the driver separately on other client workstations on which you run third-party or developed products.
See the ODBC Driver Reference Guide.
To use ODBC connections, you must configure the SAP ASE ODBC driver to allow connection to SAP ASE.