Cannot add Spend Authorization attribute when setting BPM rules in FinExmWorkflowExpenseApproval

Hi,

We have a requirement in Expenses approval in which FinExmWorkflowExpenseApproval approval flow looks at whether an Expense is tagged to a Spend Authorization or not.

When there is a tagged Spend Authorization to the Expense submitted, it will go to Workflow 1.
When there is NO tagged Spend Authorization to the Expense submitted, it will go to Workflow 2.

However, upon attempting the BPM setup, we are unable to add/find the Spend Authorization attribute.

Can someone share the correct attribute name or is there a workaround for this requirement in Expenses BPM Approval?

Thanks,

Gladys