}
@Override
public Operation exec(Prolog engine) throws PrologException {
engine.setB0();
Term a1 = arg1.dereference();
Change change = StoredValues.CHANGE.get(engine);
Account.Id ownerId = change.getOwner();
if (!a1.unify(new StructureTerm(user, new IntegerTerm(ownerId.get())), engine.trail)) {
return engine.fail();
}
return cont;
}