Hi Varun,
Regarding the Function Module MATERIAL_MAINTAIN_DARK, the best place that I have found is SE37. The documentation is very well written. Please consult.
As to your other query of finding a guide for Function Modules, I have come across this book which, I think might be useful to you. Here's the link -
http://www.amazon.co.uk/exec/obidos/ASIN/1852337753/qid%3D1101980873/202-4740338-0602224.
Hope this helps..
Regards,
Anand Mandalika.
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