Resource overload in ECC plan

Hello Gurus,
I am on a ASCP ECC plan - OPM. I have a resource, which when i go to resources and select the Horizontal plan for that particular resource i see that the available hours is less and the required hours is more. So that mean the resource is overloaded. when i click on the required hours i see what are all the items that are to be loaded in that particular resource. I see that the start date and the end date is the same that is the plan run date (i.e lets take it as 29-07-2012 00:00:00). But when i see the supplies for the particular lines i see that the certain quantities of that particular line is pegged to a different sales order which does not fall on the same day (some like 02-08-2012, 15-08-2012, etc etc). Does it mean that to satisfy that demand on 02-08-2012, 15-08-2012, it has to be manufactured today that is the plan run date like 29-07-2012. Is my understanding correct or am i wrong
Thanx & Regards

Hi,
In ECC Plans, resources are overloaded if there are firm supplies or firm operation start or end dates. Can you verify if there are too many firm supplies ?

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