Have you tackled the problem?
In the help documents of CoDeSys v3.5,
CODESYS Development System > Reference, Programming > Programming Languages and their Editors > . Sequential Function Chart (SFC) > Elements > SFC Elements 'Step' and 'Transition'
As opposed to CoDeSys V2.3, now CODESYS treats a transition condition like a method call. The entry has the following syntax:
<transition name>:=<transition condition>
(for example trans1:= a=100)
or only
<transition condition>
(for example a=100)
You will find an example (condition_xy) in the figure above.
In the help documents of CoDeSys v2.3,
Transition / Transition condition
A transition condition must have the value TRUE or FALSE. Thus it can consist of either a boolean variable, a boolean address or a boolean constant. It can also contain a series of instructions having a boolean result, either in ST syntax (e.g. (i<= 100) AND b) or in any language desired (see 'Extras' 'Zoom Action/Transition').
But a transition may not contain programs, function blocks or assignments!