But if you post more about what your goals are there might be a better way to solve it.
The goals
I have: webblog with entries which have among other things text field, which contains advertisement of this entry
I want: to place this ads on chosen entries
How I suppose to do it on publish page: for example using playa. When I publish entry (A) I can set entries (B & C) in playa field on which I want to advertise published entry (A).
To display on this entries (B & C) my ad of entry (A) I use:
{reverse_related_entries orderby="random" limit="1" weblog="myweblog"}
{ad}
{/reverse_related_entries}
everything fine, BUT
I suppose to have simultaneously vice versa functionality.
I want on publish page for entry (B) to choose entry (A) in ANOTHER playa field for displaying entry`s (A) ad on entry`s (B) page.
I use:
{myplaya orderby="RAND()" limit="1" weblog="myweblog"}
{ad}
{/myplaya}
wonderful, BUT
I do not need to display this relation in first case, that`s why I want to limit reverse related entries by the field in which I set this relation…