SLA Requirement for Intercompany Suppliers for Exchange Gain/Loss Account

Summary:

We have a requirement from Client for SLA rules. For Intercompany Supplier transaction at Payables Level, Payments Accounting should hit a specific Exchange Gain and Loss Account (For Segment 3 and Segment 5).

We've achieved this through Mapping Sets (Source as Invoice Liability Account and segment as Intercompany). But for this maintenance part is big for Business IT Team- Can someone suggest a more feasible solution to lower the maintenance.

Can we give in the sources as it should hit these accounts if the Intercompany segment is non-zero as apart from I/C Suppliers in our setups everything is zero for Intercompany Segment in Accounting?