If you are creating the formulas using script, it suggests that the formula is using a now-missing name. Perhaps the worksheet tab names on the template you are using have been changed?
Certainly not a Notes issue, in any case. Check your script and any formulas that pre-exist in the sheet, as well as all defined names.
Subject: ERROR somewhat connected to language version
the problem seems to be nailed down (credit to Mr. Jean-Etienne FUDRAL).
In the previous Notes Version (5.x) I had entered the Excel formula according to the installed language version (german, french respectively) of Excel, i.e. “=SUMME(B5:B12)”.
As reported before, after having installed Notes 6, this resulted in an error being displayed in the Excel cell.
The problem is resolved, when using the english writing, i.e. “=SUM(B5:B12)” - even though the installed Excel version is german.
Subject: don’t understand your question - more details required
Eric - do you want to do this calculation in Excel and the result should be stored in Notes or do you just want to add two field values in a Notes form into a third field inside this same Notes form?
For the first, you could use Notes f/x (field exchange) - has been introduced in the Notes 3.x time and I haven’t used it since but it was working great then.
What I’ve been doing was the other way round: taking values from Notes into an Excel sheet using OLE. This was done in a LotusScript agent (in my case).