This was added as a part of Stage 2 and it only applies to Orders. Actually, it allows you to do more than before. Here is a copy of Core 1: CPOE for Medication Orders
Use computerized provider order entry (CPOE) for medication orders directly entered by any licensed healthcare professional who can enter orders into the medical record per state, local and professional guidelines.
Previously, only ?licensed health care professionals? were allowed to enter orders for it to count towards Meaningful Use. Now, they are allowing "credentialed Medical Assistants" enter orders and count for Meaningful Use. So MA's are allowed to send orders now.
The provision you are talking about went into effect Jan 1, 2013 and applied to Stage 1 and Stage 2. It will also apply to Stage 3 when it goes into effect.