Finding Information in the BAPI Browser 
If you are using a SAPgui from a release before 4.6A, the BAPI Browser is displayed instead of the
BAPI Explorer.
To display a description of individual symbols in the BAPI Browser choose Utilities
BAPIs of SAP interface types cannot be displayed in the BAPI Browser. You have to use the Business Object Browser, as described in
Determining Details of BAPIs of Interface Types.In the application hierarchy of the BAPI Browser you can display all the SAP business object types for which BAPIs have been implemented:
The nodes Key fields and Methods are displayed.
To display details of individual BAPIs and the name of the function module that implements the BAPI, select the information icon. The name of the function module is given at the start of the documentation. The names of BAPI function modules always begin with "BAPI".
A list of all the BAPI’s parameters is displayed. Select the relevant icon in the BAPI Browser to display further information about the individual parameters.