ABAP CALL DB PROC PARAMETERS Statement syntax and functionality in SAP

CALL DATABASE PROCEDURE - parameter_list

ABAP Syntax ... [EXPORTING p1 = a1 p2 = a2 ...]
[IMPORTING p1 = a1 p2 = a2 ...].

What does it do? The additions EXPORTING and IMPORTING assign the actual parameters a1 , a2 to the input and output parameters defined in the database procedure. This method of passing parameters can be used in both static and dynamic calls.
The proxy parameters p1 , p2 , ... are specified behind the additions; these are assigned the actual procedure parameters in the mapping of the database procedure proxies . The data types of the actual parameters can be determined by referencing the type declarations of the associated database procedure interfaces . The reader positions are general expression positions .

ABAP CALL DB PROC PARAMETERS Statement syntax, information and example SAP source code