After digging into your code, I found the solution myself.
Here's the solution for those who need:
// there's a filter to alter value before post being saved
add_filter ( 'rwmb_NAME_value', 'somefunction' );
function somefunction() {
// get data
$get_data = isset( $_POST['SOMEKEY'] ) ? $_POST['SOMEKEY'] : null;
// do something with your data, multiple by 100 for instance
$modified_data = $get_data *100;
// return the modified data
return $modified_data;
}
Anyway thank you for crafting many hooks for ease of use.
Cheers.
