Multiple Reports Leading to Split Payments for Single expense reimbursement

We have different approvers for each expense type. In order to restrict the report from routing to multiple approvers, we have been submitting the separate reports for each expense type. But when multiple reports are submitted for one reimbursement, the approvals might be done at different times which leads to split payment. We would like to make only one payment for each reimbursement request.

Could you please help us through this?