Staff asked to pay for missing cash

Hi all,

Not entirely sure of how this one works out, but enquiring for an old friend.

Basically the store he works in has occasionally been down on cash, this can vary anywhere from say €10 up €70. Lately there was a stock issue at the store, and staff sold out items which were not on stock, but were advised by management to sell anyway, and the sales would be put through the tills on a later date.

After a week of the issue, it now seems their store is down by about €50 and the staff have been told they need to put the money in, or it will be taken from their wages.

Does an employer have a right to do this?

Appreciate any advice on this one, thanks.