CN21 network creation

Question

Hi All,
I have written some code in User exit EXIT_SAPLCOKO_002. this exit is related to SAP enhancement CNEX0012(Derive network number from WBS identifier).But it is not going to the Exit when i am trying to create a network through CN21 transaction. I have created a project 'ZPSNETNO' and assigned SAP enhancement CNEX0012 (Derive network number from WBS identifier) to it and activated. Can you please help me out so that I can use the EXIT_SAPLCOKO_002.
I have got following document that says this user exit is correct. Please check the document below-
Create function to derive network no. from WBS identifier
The following enhancement (user exit) is available for changing the network number:
CNEX0012   Derive network number from WBS identifier
You can use this enhancement to generate an external network number, based on the WBS element number. This enables you to immediately recognize the assignments between WBS elements and the corresponding networks.
Enhancement CNEX0012 contains the following enhancement components:
Function module exit:
EXIT_SAPLCOKO_002    Data transfer of the network number
Example
Project editing: P/0000/000/000000/00
Project number:  P/12/1/33/1 (edited)
                P001200100003301 (unedited)
Sections 3 and 4 in this example are always unique for projects that begin with "P". In this example the following network number is generated: P00003301
Activities
1. Create the enhancement.
To do this, either create a new project or use an existing one.
2. Edit the enhancement component:
Complete the coding in the program for the function module exit EXIT_SAPLCOKO_002. This exit takes the unedited WBS identifier (input) from your individual program section and then transfers the derived network number (output) back to the SAP standard program.
To do this, call up the function module and double-click on the include line.  Create the include module.
When your program section cannot derive a network number, issue the exception NO_NUMBER_GENERATED.
3. Activate your project.
Only once you have activated your project, will your enhancement take effect.
Further notes
Unlike modifications, enhancements are not influenced by a release upgrade because they are not part of the original SAP programs, rather, they exist in an area reserved for customers.
For more general information on generating enhancements refer to the documentation in the enhancement transaction under Tools -> Online Documentation.
Each enhancement has its own documentation. You can access this documentation by clicking on Display SAP Doc. in the enhancement transaction.
Nirnay Agarwal

Answer 1

Hi there,
Yes, Pardeep is correct  that field selection for Proj Def and WBSE in network header must be set to diplay that makes these fields greyed out in CN21,  you would need to change it to input or required according to your requirement.
Menu path
IMG --> Project System -->Structures >Network>User interface Settings -->Define fields selection for Networks -->Network header.
Please appriciate the help by awarding points and mark this post as answered.
Hope this helps!
Singh