[Avodah] purchasing shmitta produce

[T613K at aol.com]

This kashrus alert came in a  kashrut.com email:  
--begin quote-- 
Pomegranates and other fruits from Israel are being marketed in Pick ‘n Pay  
and other outlets. The laws of Shemitta apply to such fruits. They may be 
eaten,  but cannot be purchased with cash unless other non Shemitta items are 
purchased  together with them. They may be purchased with credit cards. 
These fruits  must be treated with respect and remnants and peels should be 
wrapped up prior  to disposal.  
--end quote-- 
Can somebody please explain what is the problem with paying cash and why  
using a credit card is OK?

--Toby  Katz
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