The answer is NO 
u have to develop customization function / operation to retrieve value from Z table.
In PCR as Remis said, you have to create customized operation.
If you read from customized Infotype (PAXXXX), you can use operation TABLE (plz using T-code PDSY to have more info about the standard operation): so u can call TABLEPXXXX. This point I'm not sure However I though I remember some entries discussing about the point, it could be done.