Filter on part of a column only

[Phillip]

I wanted a filter on part of a column only: e.g. cells J8:J505 where J8 is the column heading.
I selected cells J8:J505, then Data>Filter>AutoFilter. This appeared to work correctly as it placed the dropdown box on cell J8.
However selecting the filter shows that all subsequent cells, J506:J513, are also included.
This is a real nuisance as my spreadsheet is my personal accounts, with cells J8:J505 containing my account code, of a limited set of values: "b" for bank, "c" for credit card, "s" for cash.
Subsequent J cells - J506:J513 contain comments and cross-checks, which I do not want to filter and the values they hold make the filter selection look a mess.

Is it possible to exclude J506:J513 as I did with cells J1:J7?
or do I need to ensure all subsequent J cells are blank?
i.e. is this a limitation of Calc or is it a bug?

[acknak]

... However selecting the filter shows that all subsequent cells, J506:J513, are also included. ...

This is what I see also. No matter what I do, the autofilter always filters the entire data table. Even setting a database range doesn't restrict it.

However, the standard filter (Data > Filter > Standard Filter ...) seems to use only the selected area, if there is one.

[MrProgrammer]

I selected cells J8:J505, then Data>Filter>AutoFilter. This appeared to work correctly as it placed the dropdown box on cell J8. J506:J513 contain comments and cross-checks, which I do not want to filter and the values they hold make the filter selection look a mess.

Move J506:J513 to J507:J514, leaving J506 empty. The empty cell ends the autofilter range on my version of Open Office. I won't help further without an attachment.

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[Phillip]

Sorry MrProgrammer, my range J8:J505 already had blanks in J8, J505, and J506. The only solution I find is to keep all subsequent cells in col J blank. Deleting subsequent cells: J506: on updated the Autofilter selection list.

However further problems:
When I initially selected J8:J505, with J8 blank, CALC asked if J8 should be the header cell - Yes.
Subsequently I entered a value in J8 - this was added to the selection list. (Not the case if Autofilter on whole column).
Selecting any other filter value resulted in J8 row being hidden. CTRL+Z recovers, but also undo's all edits while filter on.
Deleting J8 did not correct, nor did deleting whole Autofilter
(Laborious as need to reselect whole range J8:J505, Data>Filter>Autofilter as it is a toggle)

Why is Data>Filter> "Remove Filter" always greyed out?

Also CALC started adding additional Filters both in col J above within my range, and even worse in other columns!

In trying to reproduce how, ended up with a corrupt file (Write error) - recovery failed too. Luckily working on a copy.
NB. Cannot reproduce either fault of on a clean file!