TestLink

I would like to create a custom field containing a single id.
If possible without changing the code Testlink to keep the vanilla versions.

thank you in advance.

at least for me is not clear what you would like to do.
would you mind to provide a clear, detailed requisite with a use case and an example ?

Hi fman, thank you for you reply.

We have several teams to write test cases. Each has its own project.
I want to add a custom field that contains a unique identifier.
This identifier represents the tested functionality. To avoid test cases to be written twice on the same subject.

For example:
I create a test case for:
The module number 4
Functionality: 6
The expected outcome is a success: 1

My custom filed this test case, the number will be 461
and it must be unique.

If someone else creates a test case for this case, it will be seen that the case has already been created. (Error custom field: value already used)