Master & detail table in one transaction

Question

Experts,
I am useing 11g 11.1.1.4 and ADF BC, I have thought about this question quite for a while.
I have a master & detail constructure in one page, master as af:form and detail as af: table.
The master is 'booking' table (booking_id, create_date, create_user, user_contact) ,
and detail is 'booking_line' table ( booking_id, booking_det_id, booking_weight, booking_volume, booking_type)
According to my customer, user have to enter the master and detail data in one transaction and once user clicked the 'Submit booking' (actually is 'commit' operation),
the system need to check at least one detail line have been entered by user, otherwise the error message issued and return back to the current page. how this one can be done? Thanks!

Answer 1

Thanks a lot M.Jabr!
I have used your suggestion as follwoing:
public String cb3_action() {
BindingContext bindingctx = BindingContext.getCurrent();
BindingContainer bindings = null;
bindings = bindingctx.getCurrentBindingsEntry();
DCBindingContainer bindingsImpl = (DCBindingContainer) bindings;
DCIteratorBinding dciter = null;
//access the iterator by its ID value in the PageDef file.
dciter = bindingsImpl.findIteratorBinding("BookingDetOlVO1Iterator");
ViewObject vo= dciter.getViewObject();
long rowsCount= vo.getEstimatedRowCount();
if (rowsCount > 0) {
OperationBinding operationBinding = (OperationBinding)bindings.getOperationBinding("Commit");
Object result = operationBinding.execute();
if (!operationBinding.getErrors().isEmpty())
return null;
return "BookingDone";
} else {
FacesContext context = FacesContext.getCurrentInstance();
FacesMessage msg = new FacesMessage(FacesMessage.SEVERITY_ERROR, null, "Please enter at least one Booking Detail line");
context.addMessage(null, msg);
return null;
but there is another propblem after testing, I found if user just click the 'createInsert' operation in detail table. but without enter any values for some required fields, then can still - return "BookingDone"; that's means the required validation are skipped. any suggestion?