Confirmation of activity (restriction by system)

Question

dear gurus,
kindly tell how can i restrict confirmation of successor activity. Example in my Network structure diagram their is only one netwrok and three internal activities and relationship is finish start for all three activity.
1. activity ===>fs===> 2.activity ===>fs ===> 3.activity
As all can see the flow, i want is when i confirm activity 2 or 3 without confirming activty 1 the system should not confirm the successor activities.
kindly help its urgent
saqib usman

Answer 1

Hi,
Please use Tcode :SMOD
Use: Enhance ment as CONFPS02.
I never tried it still, the
help is pasted below for your quick referal.
Thanks.
Please reward if helpful.
CONFPS02    PS confirmation: Customer-specific input checks 1
The enhancement CONFPS02   contains the following components:
Function exit:
EXIT_SAPLCORF_007  PS confirmation: Customer-specific input check without changes
You can use this enhancement to subject the confirmation to your own checks, after the SAP standard checks have run. The confirmation can no longer be changed.
As well as the activity (AFVGD), the complete network header (CAUFVD) and the confirmation  (AFRVD) are transfered in the interface.
Activities
1. Create the enhancement
Either create a new project or use an existing project.
2. Activate the project.
Your enhancement can only take effect after you have activated the project.
Further notes
Enhancements are, in contrast to modifications, release-insensitive, since they are not in the original SAP system, but in a name range that is reserved for customers.
You can find information about the general procedure for creating enhancements by choosing Utilities -> Documentation ->  Onlinemanual