Function calling a Procedure

[Alessandro Manzoni]

I created an udf (defined as contains sql) and a procedure (defined as 
modifies sql data).
The function eventually calls the procedure, but its get an exception 
that says that the function attempted to change data but is not defined 
as modifies sql data.
Derby reference states that a derby function cannot be defined with 
modify sql data.
Is there any way to permit the function executing registered procedures 
even if they change data?

Thank you for any information.