Ext.data.writer.Json: Encode and extraParams

Hi,

I'm using SA3 (extjs 4.2.2) when I unintentionally enabled writer.jason: encode to true.

Then I notice that this causes extraParams (theSoNo) in the SAVE scenario to pass BLANK, in my PHP code:

Code:

if(isset($_POST['theSoNo'])) {
    $selectedSoNo = $_POST['theSoNo'];
}

The IF statement returns TRUE... but $selectedSoNO has no value.

When I set writer.jason: encode to false, everything worked as

Is this a normal behavior?

I'm new to ExtJS and have not dealt with other parameters yet.