what are the field properties in V_T588MFPROPC for this infotype? Ensure its not set to unused etc. check the UIBB configuration. application configuration controller on your own (HRESS_C_PERSINFO_CONFIG). You can also see the method MODIFY_CNR_BUTTON in the feeder class of overview and detail screen (CL_HRESS_PER_DETAIL). http://scn.sap.com/thread/3210285 check your coding being done.
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