When a user event script executes before load on the print context on a vendor bill payment with credits applied, it usually provides access to the "credit" sublist in the scriptContext.newRecord parameter - however, I just found one account where it's not available and have no idea why. Any ideas why?

Permission problem maybe, is it running with elevated permissions and what role is the person where its unable to access this list.

Doesn't appear to be permission related unfortunately - seeing this as admin. However, I just changed form associated to the payment and it appeared in the available sublsits. I think I'm getting somewhere now...

Yep sounds like the right path then (and also annoying)

Ah so annoying - the credit sublist is only available when the form uses advanced pdf templates for printing. Doesn't work when using the basic pdf layout.