If you want change history on one of your newly created Ztables or infact an SAP table that
does not currently have it you will need to implement the following steps:
Enter table name of which changes need to be tracked and press insert!
You should now see the following screen, Press the save button, followed by the
Goto Utilities->Generate update pgm.
Enter details as follows, and press 'Generate'.
You will now be presented with an update program proposal screen detailing what objects will be created.
Now press save and the update program will be created.
You will now see that a function module has been created, this can now be used to make entries in the documnet history tables when any entries are made to you table:
CALL FUNCTION 'ZGMRESP_WRITE_DOCUMENT'
Change Document history menu -->