CustomerPhoneList Macro error:Ambiguous name detected

J

JoanOC

I copied the sample Northwind Customer Phone List Macro and Form.
I thought I changed all the fields to conform to my clients table. Can't
find solution.
When I click on the alpha buttons on the bottom of the form I get the
following
messages:
ambiguous name detected on click:LastName FatherFilters Before Update"
Hope someone can help. Need this for work.
 
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