Idoc Output Control Problem, Want to prevent IDoc creation

Question

I want to prevent an IDoc from being simply created if a certain condition is not met. However if I set the sy-subrc = 4 and exit from the routine it still goes ahead and creates an outbound IDoc. Here is the code from the routine. I have debugged into the code and it DOES get executed when i change order info header from VA02. I have already debugged to make sure that the following piece of code does get executed and the SY-SUBRC does get set to 4 before the execution exits the Form given below. Please suggest what I m doing wrong?
FORM KOBED_601.
If the document is incomplete (Price not on list)then no o/p is created
IF KOMKBV1-UVPRS NE c_c.
SY-SUBRC = 4.
EXIT. "(also tried using RETURN)
endif.
*} INSERT
ENDFORM.
FORM KOBEV_601.
*{ INSERT ECDK903987 1
Falls Verkaufsbeleg vollständig ist, soll Nachricht erzeugt werden
If the sales document is complete, then the output should be created.
*} INSERT
ENDFORM.

Answer 1

Wait. I think I have figured out part of the problem. The problem is that both the VOFM routine that I have written 603 is executed followed by standard SAP VOFM routine 002. Though I checked that the configuration for the output type that I m using ZBAO has the right VOFM routine number 603 set, it still does execute the Standard SAP VOFM routine 002 after executing my routine, which seems to override the SY-SUBRC = 4 that I have set. If I set the SY-SUBRC = 4 in debug mode in routine 002 then the IDoc doesnt get created.
Is there a way I can prevent it from executing the standard SAP VOFM routine 002?