There could be several reasons why the append fails.
For an explanation of where to look to solve the common issues, see:
Why can't I append some records?
at:
http://allenbrowne.com/casu-19.html

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Allen Browne - Microsoft MVP. Perth, Western Australia.
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> Dear Sirs
> I have a table with 10 fields and a checkbox (yes/no).
[quoted text clipped - 3 lines]
> appended.
> Can someone tell me what I am doing wrong?
Amateur - 14 Aug 2006 11:07 GMT
Just to be shure Allen,
Is it from the principle possible to append less records from a origin table
to a destination table (with more record fields in)?
> There could be several reasons why the append fails.
>
[quoted text clipped - 10 lines]
> > appended.
> > Can someone tell me what I am doing wrong?
Allen Browne - 14 Aug 2006 11:21 GMT
Not sure I follow that question.
Your source table has fewer records than the destination, but the
destination table has more fields than the source?
The append will append one record for each record you selected in the source
(assuming the new records are not rejected), and values will be added only
to the fields that match unless you have default values assigned on the
other fields.)

Signature
Allen Browne - Microsoft MVP. Perth, Western Australia.
Tips for Access users - http://allenbrowne.com/tips.html
Reply to group, rather than allenbrowne at mvps dot org.
> Just to be shure Allen,
> Is it from the principle possible to append less records from a origin
[quoted text clipped - 16 lines]
>> > appended.
>> > Can someone tell me what I am doing wrong?