Issues Generating Payments

My organization is attempting to generate payments using a specific account and transaction type. That type is identified by the “starting_check_number” and “bank_account” in the Payments payload.

Example:

{
"bank_account_id": 1,
"starting_check_number": 3105, (Computer Check)
"discount_date": "Payment date",
"payment_date": "Today",
"post_date": "2022-03-24T00:00:00",
"post_date_operator": "Payment date",
"post_status": "Not yet posted",
"invoices": [
{
"invoice_id": 2311,
"amount": 5.0
}
]
}

Bank subledger settings (Operating Account): NOT using “Same numbering as…”

“Bank draft” starting check number was updated from its correct starting check number (9000) to the “computer check” check number and then incremented by one. Why are we seeing this behavior? Do we need to consider how the invoices are generated/created using the API? Is there some FENXT configuration that we are missing/getting wrong?