Self Service Procurement- Auto approval rules created under 500 pounds

Summary:

We created in implementation in 2018 a rule that we created that any invoices under 500 pounds would be auto approved. This is still happening but not as frequent and seems that my be the rule is randomly selecting Pos. We no longer require this process/rule, nut not sure where this would be kept. I could see anything in Set up and maintenance or wasn't sure where to go in BPM. Im also wondering if this may be a schedule process, hence the random selected pos.

We really need to turn this off or delete the rule, as selected invoices are being paid when these invoices should not of been paid.