Cannot make changes in Leads from BOE_Activity event Root-BeforeSave

Hi all,

I have created 2 Business Objects Extensions, one for Business Object "Lead" and another for "Activity". Now I am trying that event Root-BeforeSave on "BOE_Activity" change the value of one field in "BOE_Leads" but I cannot do that. The error is: "Identifier 'check_Conver' is read-only and cannot be changed."

I have seen that Activity and Lead are in diferent Deployment Units. And both are BOEs, so I cannot use associations.

Could you help me with this, please?

Thanks in advance

Regards

Daniel