AP invoice approval stage participant Advance Skip Rule - missing variable task:payload:SOURCE

Summary:

Hi,

We have a very complex Approval in AP Invoice for Line Level and our invoices is getting stuck or rejected if we have more than 300+ AP Invoice lines. For those Invoices, we identified it as Intercompany invoices and we have skip rule inside the Participant Stages.

I think before there is a variable that I can add in the Advance -- Specify Skip Rule then we can add the below expression and it will skip the stage with this source name. But now it is no longer available in the expression builder.

Is there other way we can skip the whole participant stage based on Source? We really need to make it work because the only option is Force Approval if we can't find any solution in Approval rules. But it is not applicable because of Audit policy.