When you post an invoice against the Service entry sheet in MIRO then the accounting entries will be,
Vendor accounts - Credit
GR / IR clearing account - Debit
This sequence cannot be changed in the standard. Once you've posted invoice against a service entry sheet in MIRO then only the corresponding line items will be available on Vendor line item balance for clearing. So, I think this requirement is not possible without an enhancement.Moreover, if you explain the requirement with little bit clarity and more info would be helpful.