grantDeleteProcess.js

import("Context_lib");
import("ActivityTask_lib");
import("Document_lib");
import("system.vars");
import("system.result");

result.string(!DocumentUtil.hasDocuments("CONTACT", null, vars.get("$field.CONTACTID"))
    && !TaskUtils.hasTasks(vars.get("$field.CONTACTID"), ContextUtils.getCurrentContextId())
    && !ActivityUtils.hasActivities(vars.get("$field.CONTACTID"), ContextUtils.getCurrentContextId()));