I still think that this question is best asked to revenueaccounting, as it's a RAM question. However, this topic came up internally so I'll document the answer.
Assuming the FB is for $1,000.
LH rejects $200 on RM1.
Later, you realize you should have rejected the full $1000. There are a few ways to do this, depending on when you realize it and what's happened.
- If your RM 1 is rejected (ie, RM 2 from the OA), and you're creating RM 3, you can update the amount and reject the full $1000.
- You can create a supplementary RM 1 for the additional $800.
- You create a "replacement" RM 1 for the full $1000 and ask that the previous RM 1 be rejected. There are some benefits to this route.
For both #2 and #3 your reason text should include a reference to the previous incorrect RM.
And this is why I redirected you to the revenue accounting department. SIS supports all of these (and even using a BM) from a systems perspective, but, from my perspective, there is currently no clear RAM rule that addresses what you should do.