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Planning Calendar/Facotry Calender Error

When running MD04 on a particular Part Number, I am receiving Error Message Number 61123, Error Determining Planning Period for Calendar. I have looked at this particular Planning Calendar and the Valid From is 01/07/2009 and the Valid To is 12/28/2010, which tells me the period is defined. I then click on the Calculate Periods button and recieve the following error, 3,973 comes after end of valid factory calendar. I ran MD04 through the ABAP Debugger to verify that the US Factory Calendar is being used. I then checked in SCAL and the Valid period is 1996 through 2010. Is there anything else I need to be looking at? Thanks.

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