Validation triggering on SCD hidden single select item

[toskrip]

Description:
This was already in OC, but it is not nice. When there is single conditional display hidden item of single select type with validation logic the validation seem to trigger also when the item is in hidden state (probably having null value).

Requirements:
eCRF with control item and another item with SCD hide logic with validation. We reproduce it with the single select (int) data type (maybe it effects others as well).

Steps to follow:

1. login
2. open the eCRF in DataEntry mode
3. enter control item value to so that the SCD item stays hidden.
4. click save

Expected result:
eCRF should get saved without any error.

Actual result:
validation logic failure on SCD item causes eCRF to display error message (discrepancy note is necessary to allow to store eCRF)