I'd suggest to follow the general process described here:
A better way to migrate your SAP data with Rapid Deployment Solutions
And the Test Scripts (one per object) that are part of the information download package you got from here:
SAP Service Marketplace - RDM for S4HANA On Prem
A nice preview is also provided by the sample chapter of my migration book:
SAP Data Migration: LSMW to SAP Activate | Book and E-Book - by SAP PRESS
