warning no. 43 in NONMEM v.6.2

Dear nmusers, I have installed NONMEM version 6.2 on my notebook. when I tested it with control5, i get a warning (see bellow) however, all other things are identical. (WARNING 43) THE $PK BLOCK REQUESTS "CALL ONCE PER INDIVIDUAL RECORD", BUT DATA ITEMS ARE USED IN THE $PK BLOCK. VALUES OF THESE DATA ITEMS SUBSEQUENT TO THOSE FROM THE FIRST EVENT RECORD WILL BE IGNORED. IF THIS IS NOT APPROPRIATE, THE CALL DATA ITEM CAN BE USED TO OBTAIN ADDITIONAL CALLS, OR $PK'S CALLING PROTOCOL SHOULD BE CHANGED. I did not understand what should i do? Kind Regards Khaled