1. Create the enhancement.
To do this, either create a new project or use an existing one.
2. Create structure CI_PROJ in ABAP/4-Dictionary (transaction SE11) in your own development class.
3. Expand structure CI_PROJ to include your own fields.
Note the following:
You must use the name ranges reserved for customers.
The maximum number of fields in database tables is 749 (in PROJ and CI PROJ, that is, for SAP fields plus user-defined fields). For reasons of clarity, however, we recommend that you keep the actual number to a minimum.
SAP reserves the right to add new fields to table PROJ. If the maximum number is reached, your fields could be removed.

Activate the structure.
4. Maintain the enhancement components:
Assign the function Customer Fields a name.
Add to the program code for the function exit EXIT_SAPLCJWB_002. This function exit transfers SAP data to your part of the program.
To do this, call up the function module and double-click the include line. Create the include module.
In order to transfer the variables, you must insert a Move-corresponding statement in Include ZXCN1V11:
move-corresponding sap_proj_imp to proj.

Now define the "projs" data structure as global variable. To do this, jump to the main program SAPLXCN1. First, double click include LXCN1TOP and then include ZXCN1TOP. Create the object if required.
Include the following tables statement in the source text for include ZXCN1TOP.
* tables
tables proj.

Add to the program code for the function exit EXIT_SAPLCJWB_003. This function exit takes the data from your part of the program and transfers it to the SAP standard program. Create your own corresponding include module.
In order to transfer the variables, you must insert a Move-corresponding statement in Include ZXCN1U12:
move-corresponding proj to cnci_proj_exp.

Create the screen area.
Double-click SAPLCJWB0205_CUSTSCR1_SAPLXCN10600 and then choose Fullscreen. The screen has been preconfigured by SAP. You can delete these fields and add new ones:
Choose Goto -> Dict./Program fields
Maintain the table/field name PROJ and select the fields to appear on the screen.
Generate the screen.

For detailed information, see SAP Note number 86050.
5. Activate the project.
Only once you have activated the project, will your enhancement take effect.
6. For your customer-specific fields to be evaluated in the project information system, the structures in the project information system must be regenerated. To do this, start program RCNCT001.

The maximum number of fields in database tables is 749 (in PROJ and CI PROJ, that is, for SAP fields plus user-defined fields). For reasons of clarity, however, we recommend that you keep the actual number to a minimum.