I have a problem scanning with a model of scanner in A4 papersize using FCEngine SDK in my application, the image came out square and not rectangular.

Using Twister on this scanner the information I get is that 

(2) ICAP_SUPPORTEDSIZES.TWSS_A4 will need sideways orientation

But I see that ScanSourceSettings.Orientation property is deprecated.

Setting RotationAngle property doesn't work.

There is a way to set Orientation before scanning?