It sounds like you had some stray data in the "Suffix" field (e.g. Jr. Sr. III, IV, etc.) This field should be blank for the estate.
The batch submission will be accepted with warning if any of the following conditions are true:
 The [entity] element contains the value “Y†and one or more of the following elements associated with a non-entity person are recorded with a value in a party type (23 or 58) that may be an entity or an individual:
o IndividualBirthDateText and/or BirthDateUnknownIndicator.
o FemaleGenderIndicator, MaleGenderIndicator, and/or UnknownGenderIndicator.
o RawIndividualFirstName, FirstNameUnknownIndicator, RawIndividualMiddleName,
and/or RawIndividualNameSuffixText.
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