Subject Unsuccessful execution on delete FB 3 SP source code
Author Mr. John
Post date 2019-06-13T10:43:01Z
Using FB 3.0.4/Windows 10x64 ,I'm trying to delete SP source code as worked in 2.5:
      UPDATE RDB$PROCEDURES SET RDB$PROCEDURE_SOURCE = NULL WHERE RDB$SYSTEM_FLAG IS NULL  OR RDB$SYSTEM_FLAG=0;

bun now on FB 3 tried:

update RDB$PROCEDURES set rdb$procedure_source = NULL where rdb$procedure_name
STARTING WITH 'MYPR_'

and got 
Unsuccessful execution caused by a system error that precludes successful execution of subsequent statements.
UPDATE operation is not allowed for system table RDB$PROCEDURES.




"The ability to explicitly set the source code to NULL is restored. All other kinds of direct modifications are still prohibited"


but not working
thanks for any help