Backward- Forward  and Forward- Backward

Hi, all!
Can you explainfor me about +Backward- Forward  and Forward- Backward+ in General Setting-> Inventory tab-> Planning.
I don'nt understand it, can you make clealy
Thank you!

Hi....
Consumption Method – there are two available methods of forecast consumption
by the Sales Order:
• Backward- Forward – In this method, the Sales Order first goes
backwards to 'consume' the forecast which is closest to the Due Date of
the order and continues to the first day of the range if required (as
defined in Days Backward field below),
After that, if no forecast is found (or the forecast, which was consumed,
was insufficient) the Sales Order goes from the Order's due date and
forward (see an example below).
• Forward- Backward - In this case the sales order goes forward to
'consume' the forecast which is closest to the Due Date of the order and
continues up to the last day of the range if needed (as defined in Days
Forward field below). After that, if no forecast is found (or the forecast,
which was consumed, was insufficient) goes from the Order's due date
and backward.
Days Backward - Defines the maximum number of days for the Sales Order to go
backwards in order to 'consume' the forecast.
Days Forward - Defines the maximum number of days for the Sales Order to go
forward in order to 'consume' the forecast.
If you are not yet understand you can search in SAP Portal a note that related to that.
Or if you want, you can send me your email address and i will send you the PDF file about MRP.
It has complete explanation for you to know.
Regards,
Lina Yuanita

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