What you can do is to calculate difference between total (WHAT) you are allocation and sum of all members you allocation to (WHERE) and assign it to 1 of the members in WHERE region.
This will be WHEN/REC/ENDWHEN.
What you can do is to calculate difference between total (WHAT) you are allocation and sum of all members you allocation to (WHERE) and assign it to 1 of the members in WHERE region.
This will be WHEN/REC/ENDWHEN.