Thanks for your answer! Unfortunately, it does not work for me as
described in the manual.

For example I have an entry with the Property "Test"

* TODO test
SCHEDULED: <2015-11-01 Sun>
:PROPERTIES:
:CATEGORY: Test
:END:


C-c am

Match: Category=Test

I get a buffer that is empty except for the lines:

Headlines with TAGS match: Category=Test
Press `C-u r' to search again with new search string

Any idea?

Georg


On 30/10/2015 17:25, Subhan Michael Tindall wrote:
> Read a little further down.  It's all in the syntax, you have to
> specify a property name and value.
> From the org manual:
> C-c a m 
> Match: BIB_AUTHOR="Walter Evensong"
>
> On Fri, Oct 30, 2015 at 8:13 AM Georg Otto <g.otto@ucl.ac.uk
> <mailto:g.otto@ucl.ac.uk>> wrote:
>
>     Dear all,
>
>     I am trying to filter my entries in agenda view by properties
>
>     According to the orgmode manual, this can be done with C-c a m
>
>     However for me, C-c a m filters only on tags, not on properties. Also
>     the commands C-c / m and C-c \ give me an error, saying they are
>     undefined.
>
>     Has anybody an idea what is going on? How can I filter properties in
>     agenda view. and vice versa, how can I exclude a property from agenda
>     view?
>
>     I am running emacs 24.3.1 and orgmode 7.9.3f
>
>     Cheers,
>
>     Georg
>
>