Had a similar problem (MSSQL Server) trying to setup an Input which executed xp_readerrorlog. If you try:
EXEC sys.xp_readerrorlog 0;
You will receive an error that dbxquery does not support stored procedures. However, on a lark I tried:
EXEC('sys.xp_readerrorlog 0');
And this worked. Apparently, we can execute TSQL strings; so, all you have to do is wrap your stored procedure call in an EXECUTE command which executes a string as an SQL command.
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