Horizon Days & Time Fence

  

Hi,

Is the following correct about Horizon Days :

1) While setting-up Horizon Days for each item, the assumption is that ALL the 
items in BOM structure are having 'ZERO' stock or inventory. i.e. a starting 
point.

2) For Level 0 item i.e. Finished Product, the horizon days = Cummulative Lead 
Time for that item i.e. Cumulative Lead Time of complete BOM.

3) For any other Level, the horizon days for the item are set at Cumulative 
Lead Time from that Level Downwards till the bottom of BOM.
i.e. If there are say 7 level BOM structure starting from top Level 0 (Finished 
Product), level 1,2,3,4,5,6.
So, for any Item at say Level 3, the horizon days are set equal to the 
cumulative lead time upto Level 3 i.e. Level 3 to Level 6 (Planning Start 
Date), for Level 4 items, it is set at Cumulative Lead Time upto level 4 
starting from level 6 (planning start date) & so on, am I right ?

4) While deciding cummulative lead time at any level, it is the longest lead 
time out of All items at that level, am I right ?

5) When we talk about Lead Time, it is the time to make that item (for 
manufactured items) assuming that ALL the next level items are ready, i.e. all 
it's ingredients or child items are ready for use, Am I right ??

Is horizon days related to Time Fence. If so, how ?

Regards,
Prashanth