Remove lock on the pernr

Dear Experts,

I am upload data from flat file consists of couple of records which belongs to the same group of reference pernrs maintained in Infotype 0121.

So i uploaded the data into internal table and performing my task

I'm performing loop on internal table and dynamically calling RFC from the report.

First record executes successfully when it comes to second record I'm getting the error message "Pernr is being processed by another user" as they bolongs to the same group of reference pernrs.

So i want to remove lock on first pernr after its execution.

How z it possible