I have an issue with 2 Service Call DB concatenation rules which are not updating the information field correctly from Information Update. This is because one of the Functions in the Function outline section of each rule cannot select the Information attribute when I am building the rule.
This has the effect of the creation rule not working properly- the text in Information update is recorded twice in Information.
Also, this has the effect in the modification rule of the information update overwriting existing data in the Information field.
The only times in which I have been unable to find fields that I am certain can be selected in rules is when the workstation I am working in does not have enough resources (too many windows open or applications running).
Other than this, I have no clue why you could not select the Information field.
PS - I do exactly this with another SP20 client and have no trouble selecting Information as a field in the concatenation list. If you can't, I suggest you try clearing your client cache - that might be an issue.