FUNCTION BAPI_SALESORDER_CHANGE IMPORTING VALUE(SALESDOCUMENT) LIKE BAPIVBELN-VBELN VALUE(ORDER_HEADER_IN) LIKE BAPISDH1 STRUCTURE BAPISDH1 OPTIONAL VALUE(ORDER_HEADER_INX) LIKE BAPISDH1X STRUCTURE BAPISDH1X VALUE(SIMULATION) LIKE BAPIFLAG-BAPIFLAG OPTIONAL VALUE(BEHAVE_WHEN_ERROR) LIKE BAPIFLAG-BAPIFLAG DEFAULT SPACE VALUE(INT_NUMBER_ASSIGNMENT) LIKE BAPIFLAG-BAPIFLAG DEFAULT SPACE VALUE(LOGIC_..