Not updating a line when the value of Qtypickpackship field is not empty.

In the for loop, just get the value of the field and check if it is empty or not and continue if it is not empty.

for (j=1; j<=lineCnt; j++) {

                    var qtyPickPackShip = recSO.getLineItemValue(‘item’, ‘quantitypickpackship’, j);

                    // Continue to the next iteration if quantitypickpackship is not empty

                    if (qtyPickPackShip) {

                        continue;

                    }