Strage behaviour while executing the Procedure

Question

Hi All,
In Schema "Dwr_trade" we have one procedure Proc1. There is another schema
" Dwr_trade_user " this schema has execute privilege on Proc1 of "Dwr_trade" schema.
When we are executing the procedure Proc1 from "Dwr_trade" schema as follows
Dwr_trade --- (Procedure is created here)
Begin
Exec procedure Dwr_trade.Proc1
End;
It gives error ,but when we are executing the same procedure after removing the prefix "Dwr_Trade" it is executing successfully.
when we are executing the procedure from "Dwr_trade_user " then also is working fine.We are executing it as follows.
Dwr_trade_user
Begin
Exec procedure Dwr_trade.Proc1
End;
Any pointer why this is giving error in 1st case.
Many Thanks
Dikshit

Answer 1

Begin
Exec procedure Dwr_trade.Proc1 <----Isnt Syntax prob
End;
SQL> CREATE OR REPLACE PROCEDURE mypro AS
  2  BEGIN
  3  null;
  4  END;
  5  .
SQL> /
Procedure created.
SQL> EXECUTE PROCEDURE mypro;
BEGIN PROCEDURE mypro; END;
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00103: Encountered the symbol "PROCEDURE" when expecting one of the following:
begin case declare exit for goto if loop mod null pragma
raise return select update while with <an identifier>
<a double-quoted delimited-identifier> <a bind variable> <<
close current delete fetch lock insert open rollback
savepoint set sql execute commit forall merge
<a single-quoted SQL string> pipe
SQL> EXECUTE PROCEDURE scott.mypro;
BEGIN PROCEDURE scott.mypro; END;
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00103: Encountered the symbol "PROCEDURE" when expecting one of the following:
begin case declare exit for goto if loop mod null pragma
raise return select update while with <an identifier>
<a double-quoted delimited-identifier> <a bind variable> <<
close current delete fetch lock insert open rollback
savepoint set sql execute commit forall merge
<a single-quoted SQL string> pipe
The symbol "PROCEDURE" was ignored.
SQL> EXECUTE mypro;
PL/SQL procedure successfully completed.
SQL> EXECUTE scott.mypro;
PL/SQL procedure successfully completed.Khurram