ATP behavior explanation - urgent

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Hi,

could you please help me with understanding ATP strange behavior (in my opinion) . I'm working on missing components' list which will be updated everyday.

I've scheduled COMAC in order to recalculate stocks, reservations, PO's and update 'Missing Parts' indicator in production orders. The problem I faced is strange results of calculation. Below screenshot with highlighted line where confirmed qty doesn't cover requirement, but preceding and subsequent lines are covered. Please explain why does system act like that

Scope of check

thanks in advance

D.

 Former Member

January 09, 2014 at 22:20 PM

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 Noel Connolly replied

January 08, 2014 at 15:55 PM

The system may not necessarily execute the availability check in date order. It may be executed in a different order.

Please see the following wiki which explains this:

http://wiki.scn.sap.com/wiki/display/ERPMan/Collective+Availability+Check+-+Adjust+sequence+of+orders+checked

Maybe on your example, the reservation on 20th is the last reservation to be checked in the collective ATP check.

I would check the orders on the screen to ensure they are displayed according to the sequence that you want them to be checked for availability.

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