How to setup Invoice Approval rule to reject if invoice header requester name is blank?

Summary:

How to setup Invoice Approval rule to reject if invoice header requester name is blank

Content (please ensure you mask any confidential information):

Hello

I need to replicate the following BPM rule in Excel, however I do not know how to do it.

Please Advise

BPM Rule

RULESET NAME
InvoiceApprovalRuleSet

RULE NAME
AutoReject

IF
InvoiceHeader.requesterName is null

THEN
List Builder = Supervisory

Response Type = Required

Number of levels = 1

Starting Participant = HierarchyBuilder.getPrincipal(Task.creator,-1,"","")

Top Participant = HierarchyBuilder.getPrincipal(Task.creator,-1,"","")

Auto Action Enabled = True

Auto Action = "REJECT"

Rule Name = "AutoReject"

Version (include the version you are using, if applicable):