DML within a function

Hello all,
when I use update command within a user defined function, I got =
ORA-06512 error: Can't use DML within a function.
Is ANY possibility to modify data within a function? Some dynamic sql or =
other feature?
Why I need it:
In my db - primary key values are set by application, it mean that last =
used Id is in "counters" table. Unfortunatelly sequence objects aren't =
used. When I need new Id, i get it with stored procedure, which handles =
my "counters" table. The big disadvantage is that I can't use this =
schema for multi-row inserts, I must use cursors :-(. I know that this =
is bad solution, but I can't do anything with it now and I need improve =
db performance. If I have function, which handles my counters table, I =
would use it directly in insert command without cursor need.
Thank you for any answers.
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