AX2009 Inventory Model Group Set up As Fifo , Cost Price ( Include Physical Value box should be check or uncheck )

Ax2009  are converting to Std cost and have few items of exp items,  and setting up as Fifo  inventory model  group

for cost price  should the Include Physical value box should be check or uncheck ,

can some one please help with this question,

we have go live this weekend and have to finish set up by tomorrow,

I have read some where , it says it should be checked,  but FiFo  ,    First in first out, 

since we going std  Costing,  these exp items we are using this model group is exp items

each item is different cost, if first in first out will apply , than will not work , because as I sais in this same item might have

different cost

for example  item  10019071  we  have as  exp item  and Model group FIfo 

Cost  $ 5.00   for 5 Pcs

for next  10019071  $150.00  1  pcs

how this will work if we check the box',  we don't want to average the cost either , would like to go out as serial # cost

any  help will be appreciated

thanks in advance