Having ISsue in accessing standard Bex Variable

Dear Gurus,

As per the requirement creating Bex query on the top of Infoset using standard FI and Sd cubes. Whne I am trying to using the standard SAP delivered variables 0S_PSTNG_DATE , 0S_CLEAR_DATE. I am getting the  error as

"The following values are not present in masterdata : 0S_PSTNG_DATE"

Even I have chceked in table RSZGLBV table this varaibles are present.

Request you all to help me out.\\

Thanks

MQ