any thoughts on why an invoice wouldn't be set approved by passing approvalstatus: 2?

Record.save()?

yep, I'm saving and if I press Approve on the invoice in the UI it approves no problem

Are there any other scripts or workflows overwriting your field value?

Is

2

a valid value? Or is this another of those Transaction Status fields that needs to be

"A"

or

"SalesOrd:A"

or some other such value?

2 Is the internal ID for approved, but when searching, you're correct @erictgrubaugh Not that I can see. Works fine when being updated in a RESTlet, but not when using the same code in a scheduled script. If I set it using a user event script after submit, that works too. Its super strange

Hm, I think I'd fall back to Sean's question to see if there are any other UEs or Workflows manipulating the field

Check 'Scripted Records'