Partial Direct Deposit - Net check is less than amount to that account

Is there a formula I could use for partial direct deposits where the net check after Process Payroll is less than the amount to go to that account? 

Example:  Employee wants $750 to go to a specific account, with reminder going to another.  This week, the net check is $600.  After Process Payroll, the check is showing $750 to the account and ($150) net check.  I have to manually fix the deposit amount to show $600 so the net check isn't negative. 

Looking for a formula that basically says "if net check > $750, $750, otherwise = net pay"