CIL Liability Noitce and Non Material amendment - Public forum - Planning Advisory Service (PAS)

I have an application for Proposed residential development consisting of 32 No. 1 and 2 bed apartments with 38 associated car parking spaces and a CIL Liability notice was issued.   They are now putting in a Non Material Amendment (NOT a Section 73) to reduce the size of the floors pace which means the CIL calculation will alter.  Can I issue a new revised liability notice on a Non Material Amendment? or do they need to submit a Section 73 application?

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