Freeze a field in a grid

We had a requirement to freeze SIBA_RCVD_QTY and SIBA_YEST_NO fields in a grid.
It gets freezed on run time but then gets enabled for editing once we’re query the data. then query and snap shot is attached in the comments.

Kindly help us in this regards.

If SIBA_REQ_TBL2.SIBA_YEST_NO.Value = "Y" Then

SIBA_REQ_TBL2.SIBA_RCVD_QTY.Enabled = False;

SIBA_REQ_TBL2.SIBA_YEST_NO.Enabled = False;

End-If;