Absolute cell reference in formula does not work when sorting. Previously posted solution does not work.

I have two worksheets. Worksheet A has 5 columns. First Name, Last Name, Donation Amount, Donation Date, Contact Person. On the other worksheet I am trying to get the donations done or enabled by a certain contact person.  My formula is a simple addition: 

='Board_Donations_2013-2014'!D7+'Board_Donations_2013-2014'!D284

It's a simple addition but when I sort Worksheet A by first name, or last name or any other way the amount/number on the cells change. D7 for example is $5,000, but when I sort the list by a different parameter it becomes $20,000 or whatever amount is on that cell now. I tried to use absolute reference, but it still changes.

I want the amount/number on the cell (in this case D7 or D284) to stay consistent in the formula after sorting, not the cell location itself.

I have office XP and Excel 2010.

Any suggestions?

Thanks,

Rose