ABAP WD: Must-be-filled fields ??

Hi colleagues,
cProjects uses WD ABAP. Field controls by cPro allow to define some fields as MUST fields. But only a star is displayed, to indicate a MUST field.
Will WD ABAP provide some basis functionality to switch a field to MUST BE FILLED status with full check functionality ??
If not, what is the best-practice procedure to implement such solution in a customer project ??
Any help is welcome.
Regards,
Joerg

Hello Joerg,
As you said some ui elements Web Dynpro provide a "state" attribute that can be set to required, which in turn adds a "*" to a corresponding label. This gives a user a hint that the application expects this field to be filled.
From the perspective of an application, there are two options to move forward if a user did not enter something in such a marked field:
(a) display an error message and enforce the user to enter the value by preventing further input to other fields and/or the execution of certain functionality such as saving.
(b) display an error message, but allow the user to continue with his/her work - possibly including the execution of certain actions such as saving.
Both options are supported by the Web Dynpro framework. It is up to the designer of an application to decide which functionality should be offered. Option (b) has some advantages since it allows for quick-save and thus allows an user to i.e. gather some missing data and to continue at a later time. Of course, in such a case the application needs to mark a document as having errors or not in order to prevent it from being used in followup business processes.
There are more reasons as well. One such a reason is that an application can never be sure from where it receives its input. It can be a user interface, it can be a web service, it can be anything - even different clients with different user interfaces are possible. Hence, it is a requirement that an application checks all input. This of course includes validating that mandatory fields have been filled. An application should never rely on a certain layer on top of it to do such a thing, because if this top layer was exchanged (e.g. ui -> web service), a user could create inconsistent data assuming that this other top layer does not provide such a built-in check. So even if Web Dynpro did it internally, the application would have to do it again. This would be a waste in terms of performance and thus, it is not done.
Best regards,
Thomas

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