allocation question

Hi GL experts, hope to get your inputs on how to setup this allocation rule.

we have 2 BU's that need interunit allocation. Business units B1 and B2.

basis will be based on stats accounts defined for Business units B1 and B2 and departments DB11, DB12, DB21, DB22.

example pool amount:

Business unit -B1

Amount - 1,000,000

basis stat:

anchor Business unit B1

Business unit -B1; Department- DB11; stat- 15

Business unit -B1; Department- DB12; stat- 45

Business unit -B2; Department- DB21; stat- 30

Business unit -B2; Department- DB22; stat- 10

expected target is:

Business unit -B1; Department- DB11; Amount- 150,000

Business unit -B1; Department- DB12; Amount- 450,000