we have an GAF with a lot of steps. On the steps are only generic UIBBS(Feeder). All UIBB will be controlled by APPC and the data sharing is implement by singleton classes.
From step to step we want to validate the currently displayed data. for example from step 1 to step 2 only the mandatory fields of step 1.
Now we are not sure, where we can check the input fields.
Which possibilities are there ?