When You open The Init method of the CA after Builder You must have following lines in it:

this.WhereType          = 1 &&v Key Fields ONLY (see help for explanation)
this.Tables             = "YourNativeTable"
This.KeyFieldList       = "KEYFIELD" && Only ONE Key field but it MUST be unique for each record
This.UpdateNameList     = "KEYFIELD YourNativeTable.KeyField, SECONDFIELD YourNativeTable.SECONDFIELD.....etc" && see help
This.UpdatableFieldList = "KeyNum, SecondField....etc"