How to save schedule to harddisk as a txt file via API?

[Anonymous]

I'm a new developer of ArchiCAD. Today I try to make a menu with API to save schedule as a text file but when I open schedule, the menu always disabled. I checked with the documents or samples, menus not included with schedule type (^XX). I also try to check the APIdb databasesID, they still cannot get schedule too.

I hope many gurus can solve my problem.