PO History uploaded with program RM06EEI1, increases the PO qty

Hi SAP Experts,

We are involved in the data migration of the Purchase Order and Purchase order history.

We are migrating the PO history using the Direct Input program RM06EEI1 in LSMW.

The GR is posted successfully for the PO line item, but it creates another line item in the Delivery schedule (Qty equal to the GR Qty posted).

It also increases the PO qty ( Original PO quantity plus the GR posted quantity).

How do we fix this issue of the PO quantity getting increased from the original PO qty ?

Regards

Nainar