Hi looking for advice, just efiled a tax return for a client with self employed income who chose not to contribute to her CPP pension.  The profile program has no amount showing on line 42100, but when it was efiled and we check the Express Notice of Assessment is has included $4,000+ to line 42100.  Causing over $3,000 more owing for the client.  

What can be done about this without me paying the difference?