Backflushing Formula

What is the formula or the things to check to determine if an item will back 
flush or not. I know I can look for certain transactions like 'CI' but I was 
wondering if there was an item that was not back-flushing what are the basic 
things I should check? Basically I would like to know what fields and flags I 
should update to tell an item to back-flush or not to back-flush. If it is to 
complex to type then I understand, just figure I would throw this out there 
while I am doing research.
 
 
Thanks in advance.


 
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