Derive Supporting reference of tax rate name for item expense accounting class

Summary:

We have set Supporting reference of 'tax rate name' for item expense accounting class.

But the Supporting reference seems not populated for item expense

Create Invoice

Line 1 ITEM_EXPENSE AMOUNT 60

Line 2 ITEM_EXPENSE AMOUNT 40

Line 3 TAX (10%) AMOUNT 10

Journal Entries

Item Expense 1 Dr 60 (Supporting reference not populated)

Item Expense 2 Dr 40 (Supporting reference not populated)

Tax 1 Dr 6 (Supporting reference is populated)

Tax 2 Dr 4 (Supporting reference is populated)

Liability Item Expense 1 Cr 60 (Supporting reference not populated)

Liability Item Expense 2 Cr 40 (Supporting reference not populated)

Liability Tax 1 Cr 6 (Supporting reference is populated)

Liability Tax 2 Cr 4 (Supporting reference is populated)

Supporting reference 'tax rate name' is correctly populated fortax related journal but it seems not populated for item expense journal.