Project related sources for AP SLA rules to derive natural account

Summary

What are the project related SLA sources in payables to be used on Payables SLA rules?

Content

Hi All,

Need your help with the following scenario:

We have project-based expense reports being created in expenses cloud. After audit, these expense reports get interfaced to payables as 'Payment Request' invoice type. Our requirement is to override the natural account segment for such invoices depending upon whether a tagged project is billable or not. Now I understand that project billable flag won't be there as SLA source in payables, however, I am unable to locate even the basic project related attributes as SLA sources in AP which are present on the AP invoice line distributions e.g. project number, task number, expenditure org, expenditure type. There is something called