START-TRANSACTION-FUNCTION
This function initiates a transaction.
The START-TRANSACTION function has no parameters.
Syntax
 SET START-TRANSACTION-FUNCTION TO TRUE    CALL "I$IO" USING IO-FUNCTION             GIVING returnCode  | 
Return code:
returnCode can be any signed numeric data item and provides additional information:
>0  | Operation successful.  | 
0  | Operation failed.  |