is there a way to find the absolute difference of 2 credit accounts ??

Oracle Fusion GL Allocation rules creation through Calculation Manager:

is there a way to get the absolute difference of 2 credit accounts in oracle fusion while creating a Allocation rule ?? 

 Eg. if Account A has a credit balance of $160 and Account B has a credit balance of $100, the allocation should calculate and post their difference (160-60) = $60.

 But here it's posting (-160-60) = $-220