Lock capacity planning views

Hi,

     We are in SAP PPM 6.0.  Is there a way we could lock the capacity planning views based on certain conditions ( item status changes from 'x' to 'y').? We tried the implicit enhancement spot in the method IS_VIEW_READ_ONLY of class /RPM/CL_FIN_CAP_PLANNING_API but it did not work (it did work in PPM 5.0). We have gone through few threads related to this in the forum but they did not help. Any pointers to this is highly appreciated.

thanks.