CLOSE DATASET dset.
This statement closes the file specified in dset. dset must be character-type data object that contains the platform-specific name of the file. If the file is already closed or does not exist, the statement is ignored and the return value sy-subrc is set to 0.
If the operating system buffers data before it is written to a file and there is still data in the buffer, this data is written to the file before closing.
An opened file that was not explicitly closed using CLOSE DATASET is automatically closed when the program is exited.
If a file was opened without the FILTER addition, sy-subrc always contains the value 0.
If a file was opened using the FILTER addition,
sy-subrc contains the return value of the filter program, which is returned by the operating system. This value is generally 0 if the statement was executed with no exceptions.