import("system.vars");
import("system.result");

var leadLogId = vars.get("$field.LEADLOGID");

var canDelete = new HasLinkedObjectTester()
    .andNoEntityRows("Document_entity", "Documents", {AssignmentTable_param : "LEADLOG", AssignmentRowId_param : leadLogId}) //Documents
    .validate();

result.string(canDelete);