Cross-Deployment unit issue

HI Experts,

i am trying to create new  LeanLead  using Customer BO (Event- BeforeSave) , since Customer comes under Foundation deployment unit and LeadLead comes under CRM deployment unit,

system is not allowing me to write the code in Customer BO (Event- BeforeSave)  ,

CustomerExtensionBO - Even Before save -

if (this.CustomerRole.RoleCode.content == "CRM002") {    // CRM002 is prospect role

LeanLead.CreateWithReference(this) ;

}

error is -

Access of member 'CreateWithReference' in a cross-deployment unit is not possible.

Regards,

Abhishek