Journal approval routing based on Sum Journal line amount of all BU lines

We are using delivered 9.2 approval framework and implemented amount based routing. It is working fine for single BU based Journals When we use multiple Business units online ( inter unit journals )

the Journal routing path threshold is not considering sum Dr / Sum Cr of entire Journal lines. Instead is routing based on Header BU lines sum. This is not meeting our business requirements.

Wondering anyone out there, implemented JE routing based on Sum DR /Sum CR lines of all BU lines ?

For example

Header BU US001

Line1 BU US001 -           Dr 1000 

Line 2 BU US001                               Cr 1000

Line 3BU  US002           Dr 4500    

Line 4 BU US002                               CR 4500