@OverrideOnDemand
  @Nullable
  protected ICommonsMap <String, String> validateCustomInputParameters (@Nonnull final WPECTYPE aWPEC,
                                                                        @Nullable final DATATYPE aSelectedObject,
                                                                        @Nonnull final FormErrorList aFormErrors,
                                                                        @Nonnull final EWebPageFormAction eFormAction)
  {
    return null;
  }
@ OverrideOnDemand @ Nullable protected ICommonsMap < String , String > validateCustomInputParameters ( @ Nonnull final WPECTYPE aWPEC , @ Nullable final DATATYPE aSelectedObject , @ Nonnull final FormErrorList aFormErrors , @ Nonnull final EWebPageFormAction eFormAction ) { return null ; }
Validate custom data of the input field.

@param aWPEC
Current web page execution context. Never <code>null</code>.
@param aSelectedObject
The selected object. May be <code>null</code>.
@param aFormErrors
The form errors to be filled. Never <code>null</code>.
@param eFormAction
The form action mode. Either create, copy or edit.
@return The custom parameter to be added to the used upon success. If an
error occurred, this map may be <code>null</code>.