Change log: which fields do and which don't?

I know, there are many threads about the Change Log, but I didn’t find the answer to my question: I have a correct setup for Change Log and want to track changes to Tabel 27 Item, Fields ‘Standard Cost’, ‘Unit Cost’ and ‘Unit Price’. Everything tried, but no entries are made if I change the ‘Cost’ fields. Is this because certain code is triggered if I change these fields, or is it a Navision bug? Unit Price is correctly logged.

Witch version of Navision are you using?

Version 3.70.B

Update 1 to 3.70B fixes a problem with Change Log not logging fields with validation - see item 2 in http://www.mbsonline.org/forum/topic.asp?TOPIC_ID=12967

Thank you very much, Robert. I asked my NSC for the update.