>>Can you find which form is causing the problem?
>Naomi,
>no I cant find which form, which combobox is causing this.
>There are several forms and multilple comboxes involved, that's why I was looking for a possibility to have this error caught by my errorlogging() - it seems the default error() is not activated on error(1152)
>Rgds,
>Koen

Can you reproduce this problem on demand yourself? If yes, then you know which form is currently opened.