Submitted by: Vsevolod Migdisov (vmigdisov_gmail.com)

Is related to QA356

"EXECUTE BLOCK" statement does not support "CREATE USER":

execute block
as
begin
EXECUTE statement 'create user test1 password ''test1''';
EXECUTE statement 'create user test2 password ''test2''';
end

returns:
Unsuccessful execution caused by system error that does not preclude successful execution of subsequent statements.
Execute statement error at jrd8_execute :\n335544351 : unsuccessful metadata update
336723987 : add record error
Statement : create user test2 password 'test2'\nData source : Internal::.

Commits: 0187d66