New Post: Error E_NOTIMPL (0x80004001) when deleting Schedule+EMS rule

Hi,
I'm trying to delete delegate rule as users receive NDR due to deleted delegate account.
From manager profile I find the rule but when trying to delete it return error like:

Code: E_NOTIMPL == 0x80004001
Fucntion m_IpPropBag -->DeleteProp(ulpropTag)
File SingleMAPIPropListCtrlcpp
Line 1214

Don't find any answer on google

Thanks for your help
Gil