OnBase Expense Report interface to AP and Pay though PR

Hello all,
We are looking to develop an OnBase form for entry and approval routing of expense reports.
After submission the reports would sit in an audit queue until approved. After approval we would run a report and extract of 'approved pending payment' reports.

We are working though option of import into Lawson.

Since they will be paid through payroll that would be our preference but can't figure out how to have one payment code with multiple expense distribution lines.

Our other thought is to bring into AP for the distribution but can't figure out how to terminate the payment through AP and send over to PR.

Any help would be appreciated.