When opening a process, references to user-defined attributes, which can be
created in the Users module,
need to be taken into account. If the
cannot be found in the user manager of the target portal, a message will appear informing
you that it needs to be created before the process can be opened. In this case,
click on "OK" and create the missing attribute in the
Afterwards, you can reopen the process and
the user-defined attribute.