According to the Act 15/2003, from November 25th. That person which, with the purpose of gainig a benefit, takes something that does not belong to him/her, without the consent of the rightful owner, will be penalized, as a thief, with a penalty going from 6 to 18 months, if the value of the object being robbed, exceeds the sum of 400 euros.
When being robbed, no employee should try to phisically stop the thief, unless he/she has received the proper specialized training, in how to interfere without causing harm to themselves or other colleagues.