The value of tmnxBsxStatAaAcctCfgRadiusPlcy specifies the
RADIUS accounting policy to use.
The accounting policy must be an existing row within the
tmnxBsxRadApTable specified by the index tmnxBsxRadApName.
tmnxBsxStatAaAcctCfgRadiusPlcy can only be modified when
tmnxBsxStatAaAcctCfgType of the corresponding row is equal
to 'aa-sub(4)'.